Epidemiology and Health

Cohort Profile

Epidemiologic Questionnaire (EPI-Q) – a scalable, app-based health survey linked to electronic health record and genotype data: Maxwell Salvatore, Dylan Clark-Boucher, Lars G. Fritsche, Jacob Ortlieb, Janet Houghtby, Anisa Driscoll, Bryanne Caldwell-Larkins, Jennifer A. Smith, Chad M. Brummett, Sachin Kheterpal, Lynda Lisabeth, Bhramar Mukherjee; Epidemiol Health. 2023;45:e2023074. Published online August 8, 2023; DOI: https://doi.org/10.4178/epih.e2023074

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Abstract Summary PDF Supplementary Material: Abstract
The Epidemiologic Questionnaire (EPI-Q) was established to collect broad, uniform, self-reported health data to supplement electronic health record (EHR) and genotype information from participants in the University of Michigan (UM) Precision Health cohorts. Recruitment of EPI-Q participants, who were already enrolled in 1 of 3 ongoing UM Precision Health cohorts—the Michigan Genomics Initiative, Mental Health Biobank, and Metabolism, Endocrinology, and Diabetes cohorts—began in March 2020. Of 54,043 retrospective invitations, 5,577 individuals enrolled, representing a 10.3% response rate. Of these, 3,502 (63.7%) were female, and the average age was 56.1 years (standard deviation, 15.4). The baseline survey comprises 11 modules on topics including personal and family health history, lifestyle, and cancer screening and history. Additionally, 11 optional modules cover topics including financial toxicity, occupational exposure, and life meaning. The questions are based on standardized and validated instruments used in other cohorts, and we share resources to expedite development of similar surveys. Data are collected via the MyDataHelps platform, which enables current and future participants to share non-Michigan Medicine EHR data. Recruitment is ongoing. Cohort data are available to those with institutional review board approval; for details, contact the Data Office for Clinical and Translational Research (DataOffice@umich.edu).; Summary

Key Message
The Epidemiologic Questionnaire (EPI-Q) is an app-based, scalable health survey that collects broad, self-reported data to augment an electronic health record-linked biobank – the Michigan Genomics Initiative. Of an initial 54,043 invitations (recruitment is ongoing), 5,577 participants enrolled (10.3% response rate) and were invited to complete 11 baseline modules (including personal and family health history, lifestyle, and cancer screening and history) and 11 optional modules (including financial toxicity, occupational exposure, and life meaning). Questions are based on standardized and validated instruments used in other cohort studies and documentation is shared publicly to accelerate development of similar surveys.

COVID-19: Original Article

Did the socioeconomic inequalities in avoidable and unavoidable mortality worsen during the first year of the COVID-19 pandemic in Korea?: Rora Oh, Myoung-Hee Kim, Juyeon Lee, Rangkyoung Ha, Jungwook Kim; Epidemiol Health. 2023;45:e2023072. Published online August 3, 2023; DOI: https://doi.org/10.4178/epih.e2023072

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
This study examined changes in socioeconomic inequalities in mortality in Korea before and after the outbreak of coronavirus disease 2019 (COVID-19).
METHODS
From 2017 to 2020, age-standardized mortality rates were calculated for all-cause deaths, avoidable deaths (preventable deaths, treatable deaths), and unavoidable deaths using National Health Insurance claims data and Statistics Korea’s cause of death data. In addition, the slope index of inequality (SII) and the relative index of inequality (RII) by six income levels (Medical Aid beneficiary group and quintile of health insurance premiums) were computed to analyze the magnitude and change of mortality inequalities.
RESULTS
All-cause and avoidable mortality rates decreased steadily between 2017 and 2020, whereas unavoidable mortality remained relatively stable. In the case of mortality inequalities, the disparity in all-cause mortality between income classes was exacerbated in 2020 compared to 2019, with the SII increasing from 185.44 to 189.22 and the RII increasing from 3.99 to 4.29. In particular, the preventable and unavoidable mortality rates showed an apparent increase in inequality, as both the SII (preventable: 91.31 to 92.01, unavoidable: 69.99 to 75.38) and RII (preventable: 3.42 to 3.66, unavoidable: 5.02 to 5.89) increased.
CONCLUSIONS
In the first year of the COVID-19 pandemic, mortality inequality continued to increase, although there was no sign of exacerbation. It is necessary to continuously evaluate mortality inequalities, particularly for preventable and unavoidable deaths.; Summary

Korean summary
이 연구는 COVID-19 발생 전후 한국에서의 사망률 추이와 사망률 불평등 변화를 조사했다. 2017~2020년 사이에 총사망률과 회피가능사망률은 줄어들었지만, 사망률의 사회경제적 불평등은 더 커지는 경향을 보였다. 특히 예방가능사망과 회피불가능사망에서 불평등이 커져 지속적인 추적과 평가가 필요하다.

Key Message
This study examined the trends in mortality rates and changes in mortality inequality in Korea before and after the onset of COVID-19. Between 2017 and 2020, while the all-cause and avoidable mortality rates decreased, there was a growing trend of inequality in mortality rates based on income levels. Particularly, inequalities in preventable and unavoidable deaths have increased, emphasizing the need for ongoing evaluation.

Original Articles

Associations between adverse childhood experiences and diabetes among middle-aged and older Chinese: a social-ecological perspective: Siyu Zhu, Leying Hou, Jiaying Ma, Shuting Li, Weidi Sun, Wen Liu, Jiajun Hao, Wenhan Xiao, Siqing Cheng, Dexing Zhang, Dong Zhao, Peige Song; Epidemiol Health. 2023;45:e2023071. Published online August 2, 2023; DOI: https://doi.org/10.4178/epih.e2023071

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
This study examined the associations between adverse childhood experiences (ACEs) and diabetes within a social-ecological framework, incorporating personal and environmental unfavorable conditions during childhood from family, school, and community contexts.
METHODS
Data were obtained from the China Health and Retirement Longitudinal Study (2014 life history survey and 2015 survey), including 9,179 participants aged ≥45 years. ACEs were collected through self-report questionnaires, and participants were categorized based on the number of distinct ACEs experienced (0, 1, 2, 3, or ≥4 ACEs). Diabetes was defined by biomarkers, self-reported diagnosis, and treatment status. Logistic regression was conducted to explore the associations between ACEs and diabetes. Subgroup analyses were conducted by gender, age, and obesity status.
RESULTS
Compared with participants without ACEs, those exposed to any ACE (odds ratio [OR], 1.19; 95% confidence interval [CI], 1.01 to 1.40), 3 ACEs (OR, 1.32; 95% CI, 1.07 to 1.62) and ≥4 ACEs (OR, 1.29; 95% CI, 1.07 to 1.56) had an increased risk of diabetes. For each additional ACE, the risk of diabetes increased by about 5%. Regarding the source of ACEs, those originating from the family (OR, 1.23; 95% CI, 1.08 to 1.41) were associated with diabetes. In terms of specific ACE types, family members with substance abuse (OR, 1.23; 95% CI, 1.01 to 1.52), emotional abuse (OR, 1.28; 95% CI, 1.12 to 1.46), and poor parental relationship (OR, 1.25; 95% CI, 1.09 to 1.43) were associated with diabetes.
CONCLUSIONS
ACEs, particularly those originating from the family, were associated with diabetes. Interventions aimed at preventing and mitigating ACEs are essential for the early prevention of diabetes.; Summary

Key Message
From a social-ecological perspective, this study delineates an association between adverse childhood experiences (ACEs), particularly those originating from the family, and diabetes among middle-aged and older Chinese. Interventions aimed at preventing and mitigating ACEs are essential for the early prevention of diabetes.

Adherence to the World Cancer Research Fund/American Institute for Cancer Research and Korean Cancer Prevention Guidelines and cancer risk: a prospective cohort study from the Health Examinees-Gem study: Jeeyoo Lee, Aesun Shin, Woo-Kyoung Shin, Ji-Yeob Choi, Daehee Kang, Jong-Koo Lee; Epidemiol Health. 2023;45:e2023070. Published online August 1, 2023; DOI: https://doi.org/10.4178/epih.e2023070

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
The purpose of this study was to explore the association between adherence to 2 cancer prevention recommendations and cancer risk.

METHODS

In total, 104,386 individuals aged 40-69 years old who were recruited between 2004 and 2013 in the Health Examinees-Gem study were included. Adherence scores were constructed based on 8 items from the World Cancer Research Fund/American Institute for Cancer Research (WCRF/AICR) cancer prevention recommendations, including body weight, physical activity, diet, alcohol consumption and breastfeeding, and on 6 items from the Korean cancer prevention guidelines (smoking status, eating vegetables and fruits, salty foods, alcohol intake, physical activity, and body weight). A Cox proportional hazards model was used to estimate the associations between adherence scores and the risk of total and 5 major cancers.

RESULTS

The multivariable hazard ratio (HR) for total cancer with the high adherence score versus the lowest score (4.25-7.00 vs. 0.00-3.25) for the WCRF/AICR guidelines was 0.91 (95% confidence interval [CI], 0.82 to 1.00) in men. A reduced breast cancer risk was observed among women with the highest score. Men within the highest category of the Korean cancer prevention guideline score (3.25-6.00) had an HR of 0.80 (95% CI, 0.73 to 0.88) for developing total cancer compared to men within the lowest score (0.00-2.50). The higher adherence group among men showed lower risks of developing stomach, colorectal, and lung cancers.

CONCLUSIONS

Adhering to guidelines for cancer prevention can help to reduce the risk of developing cancer in Korean men. The association might differ by cancer type and gender.

Summary

Korean summary
- 암예방 가이드라인 준수가 실제로 암 발생을 예방하는지에 대한 해외 연구들이 다수 있으나 한국을 포함한 아시아 국가에서 수행된 연구는 없다. - 국제암연구재단 암예방수칙과 한국 암예방수칙을 준수하는 한국인 남성에서 암 발생 감소가 관찰되었다. 이러한 관련성은 암종에 따라 다르게 나타났다.

Key Message
- The adherence to the World Cancer Research Fund/American Institute of Cancer Research (WCRF/AICR) guidelines on cancer prevention has been addressed in several studies in Western countries. -Among the Korean population, adherence to WCRF/AICR cancer prevention guidelines as well as the Korean cancer prevention guidelines helps prevent cancer in men. Association varies by gender and type of cancer.

Citations

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Compliance with the WCRF/AICR Recommendations in Qualitative Adaptation and the Occurrence of Breast Cancer: A Case-Control Study
Beata Stasiewicz, Lidia Wadolowska, Maciej Biernacki, Malgorzata Anna Slowinska, Ewa Stachowska
Cancers.2024; 16(2): 468. CrossRef

Trends in dietary intake and food sources of long-chain polyunsaturated fatty acids among Korean adults between 2007 and 2018: Jae Eun Shim, Youngmi Lee, SuJin Song; Epidemiol Health. 2023;45:e2023069. Published online August 1, 2023; DOI: https://doi.org/10.4178/epih.e2023069

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Abstract PDF: Abstract
OBJECTIVES
This study examined trends in the dietary intake and food sources of long-chain polyunsaturated fatty acids (LC-PUFAs) in Korean adults from 2007 to 2018.
METHODS
In total, 46,307 adults (aged 19-64 years) were selected from the 2007-2018 Korea National Health and Nutrition Examination Surveys. Dietary data were obtained using 24-hour dietary recall. Intake levels and food sources of LC-PUFAs, including alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and linoleic acid (LA), were evaluated across the survey years and assessed based on compliance with dietary recommendations over the 2007-2018 period. Linear trends in LC-PUFAs intake levels over time were examined through multiple linear regression analysis.
RESULTS
From 2007 to 2018, ALA and LA consumption increased from 1.1 g (0.5% of energy) to 1.4 g (0.6% of energy) and from 8.6 g (3.9% of energy) to 10.0 g (4.5% of energy), respectively. EPA intake decreased from 0.14 g to 0.12 g, and EPA+DHA intake showed a decreasing trend. The proportion of individuals who did not meet the recommended intake of EPA+DHA (250 mg/day) increased (64.4 to 68.4%). Regarding changes in food sources of ALA and LA, the contributions from mayonnaise, eggs, and bread increased, while those from plant food sources decreased. Among food sources of EPA and DHA, anchovy, saury, and Atka mackerel showed lower contributions over time.
CONCLUSIONS
Our findings suggest that strategies to encourage the consumption of EPA and DHA from healthy food sources are necessary to improve cardiovascular health in the Korean population.; Summary

Unequal burdens of COVID-19 infection: a nationwide cohort study of COVID-19-related health inequalities in Korea: Jeangeun Jeon, Jieun Park, Min-Hyeok Choi, Hongjo Choi, Myoung-Hee Kim; Epidemiol Health. 2023;45:e2023068. Published online July 31, 2023; DOI: https://doi.org/10.4178/epih.e2023068

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
While the Korean government’s response to the coronavirus disease 2019 (COVID-19) pandemic is considered effective given the relatively low mortality rate, issues of inequality have been insufficiently addressed. This study explored COVID-19-related health inequalities in Korea.
METHODS
Age standardization for various health inequality indices was derived using data from the Korean National Health Insurance Service, the Korea Disease Control and Prevention Agency, and the Microdata Integrated Service of Statistics Korea. The slope index of inequality (SII) and relative index of inequality (RII) were calculated for socioeconomic variables, while absolute difference (AD) and relative difference (RD) were used for gender and disability inequalities.
RESULTS
We observed a number of COVID-19-related health outcome inequalities. Gender inequality was particularly noticeable in infection rates, with the rate of women 1.16 times higher than that of men. In contrast, socioeconomic inequality was evident in vaccination rates, with a 4.5-fold (SII, -4.519; 95% confidence interval, -7.403 to -1.634) difference between the highest and lowest household income groups. Regarding clinical progression post-infection, consistent findings indicated higher risk for men (RD for hospitalization, 0.90; severe cases, 0.54; and fatality, 0.65), individuals with disabilities (RD for hospitalization, 2.27; severe cases, 2.29; and fatality, 2.37), and those from lower socioeconomic groups (SII for hospitalization, 1.778; severe cases, 0.089; and fatality, 0.451).
CONCLUSIONS
While the infection risk was nearly ubiquitous, not everyone faced the same level of risk post-infection. To prevent further health inequalities, it is crucial to develop a thoughtful policy acknowledging individual health conditions and resources.; Summary

Korean summary
2020년 10월-2022년 4월까지의 국내 코로나-19 확진자 데이터와 건강보험 빅데이터, 사망등록통계를 연계하여 건강결과의 불평등 지표를 산출한 결과, 감염율, 백신접종율, 입원율, 중증화율, 치명률에서 소득수준(건강보험료 소득분위 기준), 성별, 장애유무에 따른 건강결과의 불평등이 확인되었다. 감염율은 여성이 남성보다 높았고, 백신접종율은 장애인과 의료급여 수급권자의 비율이 낮게 나타났고, 코로나-19로 인한 입원율과 중증화율, 치명율에서는 남성, 의료급여 수급권자, 장애인의 취약성이 두드러졌다. 본 연구의 분석결과는 국내 방역정책이 기존의 사회불평등을 충분하게 고려하지 못했을 가능성이 크며, 미래 감염병 관리 시 이를 고려하여 불평등을 완화시킬 수 있는 방향의 정책적 전략이 필요하다는 점을 시사한다.

Key Message
This study sought to investigate COVID-19-related health inequalities in Korea by linking COVID-19 registry data to the KNHIS big data and the cause of death data for the period October 2020 - April 2022. COVID-19-related health outcome inequalities were observed in infection, vaccination, hospitalization, clinical progress, and fatality by household income, gender, and disability. The infection rate was higher in women, the vaccination proportion was lower in the disabled and medical-aid beneficiaries, and men, the disabled and medical-aid beneficiaries were vulnerable in clinical progression post-infection which implies that a policy necessarily should consider existing socioeconomic inequalities for future pandemics.

Associations of cumulative average dietary total antioxidant capacity and intake of antioxidants with metabolic syndrome risk in Korean adults aged 40 years and older: a prospective cohort study (KoGES_CAVAS): Ji-Sook Kong, Jiseon Lee, Youngjun Kim, Hye Won Woo, Min-Ho Shin, Sang Baek Koh, Hyeon Chang Kim, Yu-Mi Kim, Mi Kyung Kim; Epidemiol Health. 2023;45:e2023067. Published online July 28, 2023; DOI: https://doi.org/10.4178/epih.e2023067

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
Limited and inconsistent prospective evidence exists regarding the relationship of dietary total antioxidant capacity (dTAC) and antioxidant intake with metabolic syndrome (MetS) risk. We evaluated the associations of the cumulative averages of dTAC and antioxidant intake (in 5 classes: retinol, vitamin C, vitamin E, carotenoids, and flavonoids, as well as 7 flavonoid subclasses) with the risk of MetS.

METHODS

This study included 11,379 participants without MetS, drawn from the Korean Genome and Epidemiology Study_CArdioVascular disease Association Study (KoGES_CAVAS). The cumulative average consumption was calculated using repeated food frequency questionnaires. Incidence rate ratios were estimated using a modified Poisson regression model with a robust error estimator.

RESULTS

The median follow-up period was 5.16 years, and 2,416 cases of MetS were recorded over 58,750 person-years. In men, significant inverse associations were observed in all 5 antioxidant classes, except for the highest quartile of dTAC. In women, dTAC and total flavonoids were not significantly associated with MetS; however, significant L-shaped associations were found for the remaining 4 antioxidant classes. Of the 7 flavonoid subclasses, only flavones in the highest quartile for men and flavan-3-ols in women lacked significant associations with MetS. The inverse associations were not sex-specific, but they were particularly pronounced among participants with a body mass index (BMI) of 23 kg/m<sup>2</sup> or higher.

CONCLUSIONS

The findings suggest that most antioxidant classes and flavonoid subclasses, unlike dTAC, exhibit a clear beneficial association with MetS in an L-shaped pattern in both men and women, particularly those with a high BMI.

Summary

Korean summary
농촌코호트 조사 참여자를 대상으로 식이 총항산화능, 총항산화능 하위분류, 플라보노이드 하위분류와 대사증후군 발생 위험의 전향적 연관성을 평가한 결과, 대부분의 항산화물(5개항산화물 분류:4개 항산화 비타민과 플라보노이드; 플라보노이드 7개 하부분류)에서 대사증후군과 음의 상관성을 확인할 수 있었으며 총항산화능(남자와 여자)과 플라보노이드(여자)에서 약한 연관성을 보였다. 남녀간 유의한 상호작용은 없었고 특히 BMI가 높은 집단에서 두드러졌다. 이 연구의 결과는 특히 식이 총항산화능을 구성하는 하위 유형을 적절히 섭취하는 것이 특히 비만한 성인에서 대사증후군 위험을 낮추는 예방전략으로 효과가 있을 수 있음을 시사한다.

Key Message
We observed that the cumulative average of dietary antioxidant vitamins and most flavonoids may be have pivotal roles in prevention of MetS, although there may be weak associations of dTAC and flavonoids in women. Moreover, these inverse associations were more pronounced in high BMI individuals. Our results suggest that the consumption of antioxidants and flavonoid may mitigate the MetS risk, particularly in overweight/obese individuals at high risk of developing chronic diseases.

Citations

Citations to this article as recorded by

The association of dietary total flavonoids and their subclasses with the risk of type 2 diabetes: a prospective cohort study
Hye Won Woo, Mi Kyung Kim, Kong Ji-Sook, Jiseon Lee, Min-Ho Shin, Sang Baek Koh, Hyeon Chang Kim, Yu-Mi Kim
European Journal of Nutrition.2024;[Epub] CrossRef
A Systematized Review of the Relationship Between Obesity and Vitamin C Requirements
Julia K. Bird, Edith J.M. Feskens, Alida Melse-Boonstra
Current Developments in Nutrition.2024; : 102152. CrossRef

The association between glaucoma and all-cause mortality in middle-aged and elderly Chinese people: results from the China Health and Retirement Longitudinal Study: Xiaoxu Huang, Mengqiao Xu, Minwen Zhou, Wenjia Liu, Xiaohuan Zhao, Xiaodong Sun; Epidemiol Health. 2023;45:e2023066. Published online July 21, 2023; DOI: https://doi.org/10.4178/epih.e2023066

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
This population-based, prospective cohort study investigated the association between glaucoma and mortality in older adults.
METHODS
Participants aged 45 years or older at baseline (47.9% male) were enrolled in 2011 for the China Health and Retirement Longitudinal Study (CHARLS). All-cause mortality was observed during 7 years of follow-up. The baseline data were collected in the 2011 CHARLS, and participants were followed up for 7 years (until 2018). The risk of all-cause mortality was investigated using Cox proportional-hazards regression with age as the time scale, adjusting for significant risk factors and comorbid conditions.
RESULTS
Among the 14,803 participants included, the risk of all-cause death was significantly higher among people with glaucoma than among those without glaucoma, after adjustment for other confounders (hazard ratio [HR], 1.46; 95% confidence interval [CI], 1.04 to 2.03). In a subgroup analysis based on the mean age of death, among those who were 75 years and older (n=1,231), the risk of all-cause death was significantly higher in patients with glaucoma than in those without glaucoma (HR, 1.89; 95% CI, 1.24 to 1.89).
CONCLUSIONS
Participants with glaucoma had a higher risk of all-cause mortality, especially those aged 75 years and above. Our findings revealed potential mechanisms underlying an association between glaucoma and all-cause mortality. They also highlighted the importance of glaucoma management to prevent premature death in middle-aged and older adults.; Summary

Key Message
The present study suggests that glaucoma is associated with a higher rate of mortality in middle-aged and elderly people in China, especially for those aged 75 years and older. This study provides an important reference for the design and evaluation of clinical glaucoma treatment and the management of patients of different ages.

Direct indicators of social distancing effectiveness in COVID-19 outbreak stages: a correlational analysis of case contacts and population mobility in Korea: Sojin Choi, Chanhee Kim, Kun-Hee Park, Jong-Hun Kim; Epidemiol Health. 2023;45:e2023065. Published online July 10, 2023; DOI: https://doi.org/10.4178/epih.e2023065

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
The effectiveness of social distancing during the coronavirus disease 2019 (COVID-19) pandemic has been evaluated using the magnitude of changes in population mobility. This study aimed to investigate a direct indicator—namely, the number of close contacts per patient with confirmed COVID-19.
METHODS
From week 7, 2020 to week 43, 2021, population movement changes were calculated from the data of two Korean telecommunication companies and Google in accordance with social distancing stringency levels. Data on confirmed cases and their close contacts among residents of Gyeonggi Province, Korea were combined at each stage. Pearson correlation analysis was conducted to compare the movement data with the change in the number of contacts for each confirmed case calculated by stratification according to age group. The reference value of the population movement data was set using the value before mid-February 2020, considering each data’s characteristics.
RESULTS
In the age group of 18 or younger, the number of close contacts per confirmed case decreased or increased when the stringency level was strengthened or relaxed, respectively. In adults, the correlation was relatively low, with no correlation between the change in the number of close contacts per confirmed case and the change in population movement after the commencement of vaccination for adults.
CONCLUSIONS
The effectiveness of governmental social distancing policies against COVID-19 can be evaluated using the number of close contacts per confirmed case as a direct indicator, especially for each age group. Such an analysis can facilitate policy changes for specific groups.; Summary

Korean summary
1. 사회적 거리두기의 효과를 간접적인 자료인 이동통신사와 구글데이터를 이용하여 인구 이동성 변화의 크기를 평가하였고, 직접적인 자료인 역학조사서의 확진자 1인당 밀접 접촉자 수를 산출하여 비교 평가하였다. 2. 18세 이하 연령대는 사회적 거리두기의 강화 또는 완화 단계에 따라 확진자 1인당 밀접 접촉자 수가 민감하게 변동되었으나, 성인의 경우에는 덜 민감하게 변동되었다. 3. 역학조사서에 기반하여 시계열 자료로 재가공한 확진자 1인당 밀접 접촉자 수는 사회적 거리두기 정책의 효과를 평가하는 직접적인 평가 지표로 사용될 수 있기에 충분히 검토되어야 한다.

Key Message
1. The study assessed social distancing's effectiveness by analyzing population mobility changes through mobile operator and Google data. And it was also compared with the number of close contacts per confirmed COVID-19 case based on the epidemiological survey report. 2. Younger age groups were more influenced by the social distancing policy in close contacts per confirmed COVID-19 case than adults. 3. The study suggests using close contacts per confirmed COVID-19 case from the epidemiological survey report as a direct measure of social distancing policy effectiveness.

Exploring cognitive trajectories and their association with physical performance: evidence from the China Health and Retirement Longitudinal Study: Jingdong Suo, Xianlei Shen, Jinyu He, Haoran Sun, Yu Shi, Rongxin He, Xiao Zhang, Xijie Wang, Yuandi Xi, Wannian Liang; Epidemiol Health. 2023;45:e2023064. Published online July 9, 2023; DOI: https://doi.org/10.4178/epih.e2023064

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
The long-term trends of cognitive function and its associations with physical performance remain unclear, particularly in Asian populations. The study objectives were to determine cognitive trajectories in middle-aged and elderly Chinese individuals, as well as to examine differences in physical performance across cognitive trajectory groups.

METHODS

Data were extracted from the China Health and Retirement Longitudinal Study. A total of 5,701 participants (47.7% male) with a mean age of 57.8 (standard deviation, 8.4) years at enrollment were included. A group-based trajectory model was used to identify cognitive trajectory groups for each sex. Grip strength, repeated chair stand, and standing balance tests were used to evaluate physical performance. An ordered logistic regression model was employed to analyze differences in physical performance across cognitive trajectory groups.

RESULTS

Three cognitive trajectory groups were identified for each sex: low, middle, and high. For both sexes, higher cognitive trajectory groups exhibited smaller declines with age. In the fully adjusted model, relative to the low trajectory group, the odds ratios (ORs) of better physical performance in the middle cognitive group were 1.37 (95% confidence interval [CI], 1.17 to 1.59; p<0.001) during follow-up and 1.40 (95% CI, 1.20 to 1.64; p<0.001) at the endpoint. The ORs in the high trajectory group were 1.94 (95% CI, 1.61 to 2.32; p<0.001) during follow-up and 2.04 (95% CI, 1.69 to 2.45; p<0.001) at the endpoint.

CONCLUSIONS

Cognitive function was better preserved in male participants and individuals with higher baseline cognitive function. A higher cognitive trajectory was associated with better physical performance over time.

Summary

Key Message
Three cognitive trajectory groups were identified for each sex in middle-aged and elderly Chinese people. Cognitive function was found to be better preserved in male participants and individuals with higher baseline cognitive function. Better cognitive trajectory was associated with better physical performance over time.

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Longitudinal trajectories of cognitive aging
Elena Lobo, Patricia Gracia-García, Antonio Lobo
Current Opinion in Psychiatry.2024; 37(2): 123. CrossRef

Effects of multigrain rice and white rice on periodontitis: an analysis using data from the Korea National Health and Nutrition Examination Survey 2012-2015: Seung-Hee Ryu, Zi-lan Wang, Seon-Jip Kim, Hyun-Jae Cho; Epidemiol Health. 2023;45:e2023063. Published online July 3, 2023; DOI: https://doi.org/10.4178/epih.e2023063

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Abstract Summary PDF: Abstract
OBJECTIVES
Numerous studies have investigated the efficacy of whole grains; however, research on multigrain remains limited. Grains exhibit combined positive effects against various diseases. The purpose of this study was to examine the impact of multigrain and white rice consumption on periodontitis.
METHODS
We analyzed data from the Korea National Health and Nutrition Examination Survey V-3 and VI, collected between 2012 and 2015, which included 12,450 patients (4,859 male and 7,591 female) aged 19-64 years. The World Health Organization’s Community Periodontal Index (CPI) was utilized to assess the presence of periodontitis, with periodontitis defined as a CPI index score of ≥3. Multivariable logistic regression analysis was performed after adjusting for potential confounding variables.
RESULTS
The group that consumed only multigrain rice was less likely to have periodontitis than the group that consumed only white rice (odds ratio [OR], 0.80; 95% confidence interval [CI], 0.69 to 0.93). When stratified by sex, the risk of periodontitis demonstrated a 24% decrease in female who consumed only multigrain rice (OR, 0.76; 95% CI, 0.62 to 0.93). A similar result was observed in the age group of 40-64 years (OR, 0.84; 95% CI, 0.71 to 0.99). In the diabetes stratification model, the normal group that consumed only multigrain rice exhibited a 25% decrease in the odds of periodontitis (OR, 0.75; 95% CI, 0.62 to 0.91).
CONCLUSIONS
Our findings suggest that the prevalence of periodontitis may vary depending on the type of rice consumed.; Summary

Korean summary
본 연구에서는 우리나라의 대규모 자료를 이용하여 쌀 섭취 종류가 치주염 위험에 미치는 영향을 살펴보았다. 우리의 연구 결과는 잡곡밥을 매일 2회 이상 섭취하는 것이 흰쌀밥을 먹는 것보다 치주염 예방에 더 효과적이라는 것을 보여준다. 이러한 결과는 당뇨병이 있는 사람에 비해 건강한 사람, 남성보다는 여성, 40~64세에서 더 큰 예방 효과를 시사한다.

Key Message
In this study, we examined the impact of different types of rice consumption on the risk of periodontitis using large-scale data from Korea. The group that consumed only multigrain rice was less likely to have periodontitis than the group that consumed only white rice (odds ratio [OR]=0.80; 95% confidence interval [CI], 0.69–0.93). The risk of periodontitis was reduced by 24% in female who consumed only multigrain rice, 16% decrease in the 40–64 age group, and in the diabetic stratification model, the normal group who consumed only multigrain rice had a 25% decrease in periodontitis risk.

Food literacy and its relationship with food intake: a comparison between adults and older adults using 2021 Seoul Food Survey data: Seulgi Lee, Sohyun Park, Kirang Kim; Epidemiol Health. 2023;45:e2023062. Published online July 3, 2023; DOI: https://doi.org/10.4178/epih.e2023062

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Abstract Summary PDF

Abstract

OBJECTIVES
This study was conducted to examine the differences in food literacy between adults and older adults and the association of food literacy with food group intake.

METHODS

In total, 4,039 participants from the 2021 Survey for Food Consumption in Seoul were included in this study. The intake of whole grains, high-protein foods, total vegetables, vegetables excluding kimchi and pickles, fresh fruits, and milk and dairy products was assessed using a simple food frequency questionnaire. Food literacy was measured using a food literacy measurement questionnaire.

RESULTS

With the exception of milk and dairy, adults had a significantly higher proportion of insufficient food intake than older adults (p<0.001). Both adults and older adults with sufficient food group consumption had higher food literacy scores. Notably, the difference in food literacy scores by level of food intake was highest for fresh fruits (p<0.001). After adjusting for confounding factors affecting food literacy scores, a higher score was associated with a lower probability of having insufficient food intake in all food groups for both adults and older adults. Specifically, those in the highest food literacy score quartile were less likely to have insufficient intake of vegetables (odds ratio [OR], 0.35; 95% confidence interval [CI], 0.28 to 0.43) and fresh fruits (OR, 0.32; 95% CI, 0.24 to 0.43), compared to the lowest quartile.

CONCLUSIONS

Improving food literacy is an important factor for promoting healthy food intake in older adults as well as adults. Therefore, it is necessary to develop intervention programs to work toward this goal.

Summary

Korean summary
건강정보 이해능력(health literacy)은 노인에서 만성질환이나 인지능력과의 관련성이 보고되고 있으나 영양정보 이해능력(food literacy)에 대한 연구는 미비하다. 급변하는 식이 환경에서 식사 및 영양과 관련된 정보를 올바르게 이해하고 판단할 수 있는 영양정보 이해능력은 노인성 질환 예방에 중요하다. 본 연구에서 영양정보 이해능력과 식품군 섭취와의 상관성을 분석한 결과 영양정보 이해능력이 높은 노인이 건강한 식품 섭취 부족 위험이 낮았다. 특히 과일 섭취 부족 위험은 영양정보 이해능력이 높은 노인에서 뚜렷하게 낮았다. 국내 영양정보 이해능력 연구는 초기 단계로 주로 성인 대상으로 연구가 이루어져서 본 연구에서의 결과는 그 의의가 크며, 영양정보 이해능력 향상은 성인과 마찬가지로 노인에서도 건강한 식품 섭취를 위한 중요한 요인으로서 이를 위한 프로그램 개발이 필요할 것으로 사료된다.

Key Message
The study on food literacy among older adults in Korea is significant as previous research has mostly focused on adults. The results showed that older adults with higher food literacy score had lower risk of insufficient food intake as compared with those with lower food literacy score. Specifically, the risk of insufficient fresh fruits intake was the lowest among older adults with higher food literacy score. Therefore, improving food literacy is an important factor for promoting healthy food consumption among older adults.

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Self-perceived food literacy in relation to the quality of overall diet and main meals: A cross-sectional study in Japanese adults
Kentaro Murakami, Nana Shinozaki, Tsuyoshi Okuhara, Tracy A. McCaffrey, M. Barbara E. Livingstone
Appetite.2024; 196: 107281. CrossRef

Non-linear relationship between body mass index and self-rated health in older Korean adults: body image and sex considerations: Seok-Joon Yoon, Jin-Gyu Jung, Soon-Ki Ahn, Jong-Sung Kim, Jang-Hee Hong; Epidemiol Health. 2023;45:e2023061. Published online June 20, 2023; DOI: https://doi.org/10.4178/epih.e2023061

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
The purpose of this study was to investigate the association between body mass index (BMI) and self-rated health (SRH) in older adults aged over 65 years while examining the influence of self-perceived body image (SBI) and sex.
METHODS
Raw data were obtained from the Korea Community Health Survey, which included BMI measurements of Koreans aged over 65 years (n=59,628). Non-linear relationships between BMI and SRH were analyzed separately for each sex using restricted cubic splines while controlling for SBI and other confounding variables.
RESULTS
Men showed a reverse J-shaped association, while women showed a J-shaped association between BMI and poor SRH. However, including SBI in the model changed this association for men to an inverted U-shape showing a negative direction, with the highest risk of poor SRH observed in the underweight to overweight range. For women, a nearly linear positive relationship was observed. Regardless of BMI, those who perceived their weight as not “exactly the right weight” had a higher risk of poor SRH than those who perceived their weight as “exactly the right weight” in both men and women. Older men who thought they were much too fat or too thin had similar highest risks of poor SRH, whereas older women who thought they were too thin had the highest risk of poor SRH.
CONCLUSIONS
The findings of this study emphasize the importance of considering sex and body image perceptions when assessing the relationship between BMI and SRH in older adults, especially in men.; Summary

Korean summary
자가 평가 건강 상태 (self-rated health, SRH)와 체질량지수는 각각 건강에 많은 관련이 있는 것으로 밝혀져 있다. 하지만 둘 사이의 관계는 연구마다 다양하게 나타나 있고, 노인들을 대상으로 한 연구도 많지 않다. 노인들은 본인들의 체중을 낮게 평가하는 경향이 있어 둘 사이 관계를 살펴볼 때 자기 인지 체형에 대한 고려가 필요하며, 성별에 따른 영향도 역시 고려해봐야 한다. 본 연구에서는 체질량지수로 파악한 비만의 정도에 관계없이 남성과 여성 모두에서 자기 인지 체형이 정상인 경우에 좋지 않은 SRH를 가질 위험성이 낮았다. 남성에서는 체질량지수와 SRH의 관계가 불분명하게 나타났고 자기 인지 체형이 더 중요한 요인으로 보인다. 한편 여성에서는 체질량지수가 증가함에 따라 SRH도 나빠지는 경향을 보였다. 이에 노인들의 비만과 관련된 교육에 있어서는 자가 인지 체형과 체질량지수를 이용한 비만의 기준에 대해 포함하는 것이 중요하다.

Key Message
Previous research has not fully explored the relationship between BMI, SBI, and SRH in older adults. Our study, using big data, found that the relationships differed between men and women. Those who perceived their weight as ‘exactly the right weight’ had the lowest risk of poor SRH. In men, BMI had a weak effect on SRH, while in women, the risk of poor SRH increased as BMI increased. We recommend that healthcare providers should educate older adults about BMI standards and help them identify their SBI for effective obesity counseling.

Cancer incidence among male construction workers in Korea: a standardized incidence ratio analysis, 2009-2015: Soonsu Shin, Woo-Ri Lee, Jin-Ha Yoon, Wanhyung Lee; Epidemiol Health. 2023;45:e2023060. Published online June 19, 2023; DOI: https://doi.org/10.4178/epih.e2023060

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
Construction workers face an elevated risk for several types of cancer. Nevertheless, there is a lack of large-scale epidemiological studies examining the risk of all cancers in construction workers. This study aimed to investigate the risk of various cancers in male construction workers using the Korean National Health Insurance Service (NHIS) database.
METHODS
We used data from the NHIS database from 2009 to 2015. Construction workers were identified using the Korean Standard Industrial Classification code. We calculated the age-standardized incidence ratios (SIRs) and 95% confidence intervals (CIs) for cancer occurrence in male construction workers compared to all male workers.
RESULTS
Compared to all male workers, the SIRs for esophageal cancer (SIR, 1.24; 95% CI, 1.07 to 1.42) and malignant neoplasms of the liver and intrahepatic bile ducts (SIR, 1.18; 95% CI, 1.13 to 1.24) were significantly higher in male construction workers. The SIRs for malignant neoplasms of the urinary tract (SIR, 1.19; 95% CI, 1.05 to 1.35) and non-Hodgkin lymphoma (SIR, 1.21; 95% CI, 1.02 to 1.43) were significantly elevated in building construction workers. The SIR for malignant neoplasms of the trachea, bronchus, and lung (SIR, 1.16; 95% CI, 1.03 to 1.29) was significantly higher in heavy and civil engineering workers.
CONCLUSIONS
Male construction workers have an increased risk for esophageal cancer, liver cancer, lung cancer, and non-Hodgkin’s cancer. Our results indicate that tailored strategies for cancer prevention should be developed for construction workers.; Summary

Korean summary
건설 노동자는 작업환경에서 수많은 유해 인자에 노출되지만, 건설 노동자에서 암의 연령 표준화 발생비를 조사한 역학 연구는 부족하다. 이번 연구에서 식도암과 간담도암의 연령 표준화 발생비는 전체 남성 근로자에 비해 남성 건설 근로자에게서 증가하였다. 이러한 결과는 건설 근로자에서 암 위험이 증가했음을 나타내며, 이 직업군에서 암 예방을 위한 추가 연구와 정책이 필요함을 의미한다.

Key Message
Despite the exposure of construction workers to numerous hazardous substances at workplace, epidemiological studies investigating the risk of all cancers in this occupational group are lacking. In this study, the age-standardized incidence ratio of esophageal cancer and hepatobiliary cancers increased in male construction workers compared to all male workers. Our results underscore the increased several cancer risks faced by male construction workers, necessitating the development of tailored strategies for cancer prevention in this occupational group.

Regional differences in the associations of diet quality, obesity, and possible sarcopenia using the seventh Korea National Health and Nutrition Examination Survey (2016-2018): Hyeongyeong Lee, Sohyun Park; Epidemiol Health. 2023;45:e2023059. Published online June 19, 2023; DOI: https://doi.org/10.4178/epih.e2023059

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Abstract PDF

Abstract

OBJECTIVES
Sarcopenic obesity is closely related to aging and the prevalence of various chronic diseases and frailty. The purpose of this study was to analyze whether diet quality is related to obesity, sarcopenia, and sarcopenic obesity, and if so, to explore the difference in that relationship between urban and rural settings.

METHODS

Using data from the Korea National Health and Nutrition Examination Survey of 2016-2018, a total of 7,151 participants aged 40 years or older were analyzed. Sarcopenia was diagnosed using handgrip strength. Diet quality was assessed using Korea Healthy Eating Index (KHEI) scores, and obesity was determined based on participants’ abdominal circumference. Multinomial logistic analysis was used for testing statistical significance.

RESULTS

Rural participants had significantly lower KHEI scores and a higher prevalence of sarcopenic obesity than urban participants. The study findings demonstrate that participants without obesity, sarcopenia, or sarcopenic obesity had significantly higher KHEI scores in both rural and urban settings. Multinomial regression analysis further revealed that a higher KHEI score was associated with a lower risk of sarcopenia and sarcopenic obesity among urban residents, while only the risk of obesity was lower with higher diet quality scores among rural residents.

CONCLUSIONS

Since diet quality and health status were lower in rural areas, it is important to address this regional disparity with appropriate policy measures. To mitigate urban health disparities, urban residents in poor health with few resources should also be supported.

Summary

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Association of Dietary Protein Sources and Their Adequacy, Body Composition and Risk of Sarcopenic Obesity in South Korean Populations: A Cross-Sectional Study
Jieun Kim, Kyoungsik Jeong, Sueun Lim, Siwoo Lee, Younghwa Baek
Metabolites.2024; 14(2): 130. CrossRef
Association of Combining Diet and Physical Activity on Sarcopenia and Obesity in Elderly Koreans with Diabetes
Sohye Kim, Soojeong Kim, Kyung Hee Hong
Nutrients.2024; 16(7): 964. CrossRef

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