Epidemiology and Health

Original Articles

Folate, vitamin B12, and homocysteine status in the Korean population: data from the 2013-2015 Korea National Health and Nutrition Examination Survey: Sihan Song, Bo Mi Song, Hyun-Young Park; Epidemiol Health. 2024;46:e2024007. Published online December 11, 2023; DOI: https://doi.org/10.4178/epih.e2024007

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
We aimed to assess the serum folate, vitamin B12, and homocysteine status in Korean adolescents and adults using national data.
METHODS
Blood samples were collected from participants aged ≥10 years in the Korea National Health and Nutrition Examination Survey 2013-2015. The stored serum samples were used to measure folate, vitamin B12, and homocysteine concentrations. A total of 8,016 participants were included in this analysis. Unweighted descriptive statistics and adjusted geometric means of the B vitamins and homocysteine concentrations were estimated.
RESULTS
Females had higher serum folate and vitamin B12 concentrations and lower serum homocysteine concentrations than males. Folate deficiency (<6.8 nmol/L) and hyperhomocysteinemia (>15 μmol/L) were found in 8.6% and 11.8% of males, respectively. Approximately 3% of males had low or marginally low vitamin B12 status (≤221 pmol/L). Folate and vitamin B12 deficiencies and hyperhomocysteinemia were found in <2% of females. Suboptimal folate status was prevalent among adolescents and young adults, while suboptimal vitamin B12 status and hyperhomocysteinemia were relatively higher in older adults. Adjusted mean homocysteine concentrations were sharply decreased from the first to second decile of serum folate in males.
CONCLUSIONS
In the Korean population, the proportion of males who achieved desirable folate and homocysteine concentrations were lower than those of females. Although most Koreans have adequate vitamin B12, a suboptimal folate status is common, particularly among adolescents and young adults. These findings could establish a foundation for public health initiatives aimed at improving folate levels in the Korean population.; Summary

Korean summary
엽산과 비타민B12는 전 생애에 걸쳐 건강에 영향을 미치는 필수 비타민이다. 그러나 해당 비타민 상태에 대한 국내 자료는 부족한 실정이다. 본 연구는 국민건강영양조사 참여자로부터 수집된 혈청으로부터 엽산, 비타민B12, 그리고 이들의 기능성 지표인 호모시스테인 농도를 측정하였고 성별과 연령별 분포와 적합 상태를 평가하였다. 엽산 결핍과 고호모시스테인혈증은 남성에서 높은 유병률을 가졌다. 적정 엽산 상태를 충족하지 못하는 비율은 청소년과 젊은 성인에서 흔하게 관찰되었다. 대부분의 한국인은 충분한 비타민B12 수준을 가졌으나, 노인의 경우 정기적인 평가가 필요하다. 본 연구는 한국인이 최적의 엽산과 비타민B12 상태를 유지하기 위한 기반적 근거를 제공한다.

Key Message
Folate and vitamin B12 have significant health impacts throughout the life cycle. However, national-level data on B vitamins in Korea are limited. Serum folate, vitamin B12, and homocysteine concentrations were measured from samples stored during the national survey. In our study, the proportions of folate deficiency and hyperhomocysteinemia were higher in men than in women.Suboptimal folate status was common among adolescents and young adults. Most Koreans had adequate levels of vitamin B12; however, regular monitoring is warranted, especially in the older population. The current data provide a future direction for achieving optimal B vitamin status in the Korean population.

Item non-response imputation in the Korea National Health and Nutrition Examination Survey: Serhim Son, Hyemi Moon, Hyonggin An; Epidemiol Health. 2022;44:e2022096. Published online October 28, 2022; DOI: https://doi.org/10.4178/epih.e2022096

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
The Korea National Health and Nutrition Examination Survey (KNHANES) is a public health survey that assesses individuals’ health and nutritional status and monitors the prevalence of major chronic diseases. In general, sampling weights are adjusted for unit non-responses and imputation is conducted for item non-responses. In this study, we proposed strategies for imputing item non-responses in the KNHANES in order to improve the usefulness of data, minimize bias, and increase statistical power.

METHODS

After applying logical imputation, we adopted 2 separate imputation methods for each variable type: unweighted sequential hot-deck imputation for categorical variables and sequential regression imputation for continuous variables. For variance estimation, multiple imputations were applied to the continuous variables. To evaluate the performance of the proposed strategies, we compared the marginal distributions of imputed variables and the results of multivariable regression analysis for the complete-case data and the expanded data with imputed values, respectively.

RESULTS

When comparing the marginal distributions, most non-responses were imputed. The multivariable regression coefficients presented similar estimates; however, the standard errors decreased, resulting in statistically significant p-values. The proposed imputation strategies may cope with the loss of precision due to missing data, thus enhancing statistical power in analyses of the KNHANES by providing expanded data with imputed values.

CONCLUSIONS

The proposed imputation strategy may enhance the utility of data by increasing the number of complete cases and reducing the bias in the analysis, thus laying a foundation to cope with the occurrence of item non-responses in further surveys.

Summary

Korean summary
본 연구는 국민건강영양조사에서 발생한 항목무응답의 대체방법에 대해 연구한다. 본 논문에서 제시된 논리적 대체와 무응답 대체법을 이용해 대체된 데이터를 제공함으로써 결과의 편향 감소와 통계적 검정력 향상을 기대할 수 있다. 또한, 본 연구의 결과는 추후 데이터 수집시 발생하는 무응답 발생의 최소화를 위한 대책마련에 사용될 수 있다.

Key Message
The proposed logical imputation and item non-response imputation strategy may enhance the utility of data by increasing the number of complete cases and reducing the bias in the analysis, thus laying a foundation to cope with the occurrence of item non-responses in further surveys.

Citations

Citations to this article as recorded by

Associations of mediterranean diet score and age-related macular degeneration in Korean elderly
Won Jang, Jungeun Choi, Hyesook Kim
BMC Public Health.2024;[Epub] CrossRef

COVID-19: Special Article

Mental health of Korean adults before and during the COVID-19 pandemic: a special report of the 2020 Korea National Health and Nutrition Examination Survey: Hyunsuk Jeong, Suyeon Park, Jihee Kim, Kyungwon Oh, Hyeon Woo Yim; Epidemiol Health. 2022;44:e2022042. Published online April 25, 2022; DOI: https://doi.org/10.4178/epih.e2022042

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
Coronavirus disease 2019 (COVID-19) and the associated social distancing, limited freedom, and fear of an uncertain future are expected to have substantial mental health effects. We investigated mental health responses in the community during the first year of the COVID-19 pandemic in Korea.

METHODS

We used 2016-2019 and 2020 data from the Korea National Health and Nutrition Examination Survey (KNHANES) to assess pre-pandemic and pandemic mental health status, respectively, in terms of perceived severe stress, depression, and suicidal plans. All analyses were gender-stratified. Pre-specified subgroup analyses were performed according to age, employment status, and household income.

RESULTS

The percentage of Korean adults with suicidal plans increased significantly from 1.3%p (95% confidence interval [CI], 1.1 to 1.5) in 2016-2019 to 1.8%p (95% CI, 1.4 to 2.1) in 2020. Individuals in their 20s and 40s showed a marked increase in suicidal plans (1.2%p; 95% CI, 0.0 to 2.3 and 0.9%p; 95% CI, 0.0 to 1.8, respectively). In men, depression and perceived severe stress increased significantly from pre-COVID-19 to 2020. There was a 2.4%p (95% CI, 0.8 to 4.0) increase in depression among standard workers and a 2.9%p increase in depression in individuals in the second-highest quintile of household income from 2016 and 2018 to 2020.

CONCLUSIONS

As COVID-19 continued, mental health issues such as suicidal plans, depression, and severe stress increased significantly in young men and people in the second-highest quintile of household income. Proactive community mental health efforts are needed to prevent increases in the suicide rate resulting from prolonged exposure to the COVID-19 pandemic.

Summary

Korean summary
코로나19 이전에 비해 코로나19 유행 첫 해 동안에 전체 인구에서 자살 계획 유병율이 유의하게 증가하였고 특히 20대-40대에서 증가 비율이 높았다. PHQ-9으로 측정한 우울증 유병율은 전체 남성에서 증가하였고 특히 30대 남성에서 증가 비율이 높았다. 코로나19 영향으로 자살 계획과 우울증과 같은 정신 건강 문제가 젊은 성인에서 크게 증가하였기 때문에 이러한 정신건강 문제가 자살률 증가로 이어지는 것을 방지하기 위해 국가적 차원의 체계적인 정책과 적극적인 지역사회 정신건강 중재가 필요하다.

Key Message
There was a significant increase in the prevalence of suicidal plan in the overall population during the first year of COVID-19 pandemic compared to pre-COVID-19. In particular, suicide plans increased among those in their 20s and 40s. The prevalence of PHQ-9 detected depression increased in all men, especially among men in their 30s. As mental health problems such as suicide planning and depression have significantly increased among young adults due to the impact of COVID-19, systematic policies at the national level and active community mental health interventions are needed to prevent these mental health problems from leading to an increase in suicide rates.

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COVID-19: Special Article

Obesity, hypertension, diabetes mellitus, and hypercholesterolemia in Korean adults before and during the COVID-19 pandemic: a special report of the 2020 Korea National Health and Nutrition Examination Survey: Ga Bin Lee, Yoonjung Kim, Suyeon Park, Hyeon Chang Kim, Kyungwon Oh; Epidemiol Health. 2022;44:e2022041. Published online April 25, 2022; DOI: https://doi.org/10.4178/epih.e2022041

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
We investigated trends in obesity, hypertension, diabetes, and hypercholesterolemia before and during the coronavirus disease 2019 (COVID-19) pandemic in the Korean adult population.

METHODS

Data from 60,098 participants in the Korea National Health and Nutritional Examination Survey between 2011 and 2020 aged ≥19 were used. The age-standardized prevalence and annual percent changes (APCs) were calculated for obesity (body mass index ≥25 kg/m2), hypertension (systolic/diastolic blood pressure ≥140/90 mmHg or under treatment), diabetes (hemoglobin A1c ≥6.5%, fasting glucose ≥126 mg/dL, physician diagnosis, or under treatment), and hypercholesterolemia (total cholesterol ≥240 mg/dL or under treatment).

RESULTS

Over the past decade (2011-2020), the age-standardized APCs (95% confidence intervals) for obesity, hypertension, diabetes and hypercholesterolemia were 3.0% (2.1 to 3.8), 0.1% (-1.3 to 1.5), 1.5% (-1.0 to 4.0) and 8.0% (5.7 to 10.3), respectively, in men; and -0.2% (-1.5 to 1.2), -0.5% (-1.9 to 0.9), -0.1% (-2.3 to 2.2) and 5.9% (3.9 to 8.0), respectively, in women. In 2020 compared to the previous 3 years (2017-2019), obesity, hypertension, diabetes, and hypercholesterolemia increased in men (6.0, 1.8, 1.9, and 2.8%p, respectively), but an increase was not apparent in women (2.5, -1.1, 0.8, and 0.7%p, respectively).

CONCLUSIONS

An increase in major chronic diseases was observed in Korean adults, especially men, during the COVID-19 pandemic. In order to reduce the burden of cardiovascular and metabolic diseases in the future, effective intervention strategies need to be developed according to the characteristics of the target groups.

Summary

Korean summary
한국인의 비만, 고혈압, 당뇨 및 고지혈증 유병률은 지난 10년간 전반적으로 증가하는 경향을 보였다. 특히, 코로나 19가 유행한 2020년에 남성의 주요 만성질환 유병률은 지난 3년 평균치와 비교하였을 때 모두 유의하게 증가하였다. 반면, 여성에서 만성질환 유병률의 뚜렷한 증가는 관찰되지 않았다.

Key Message
During COVID-19 pandemic, the overall increase in major chronic diseases was observed in Korean adults, and this trend was prominent in men. Accordingly, target-specific intervention strategies need to be developed to reduce the burden of cardiovascular and metabolic diseases in the future.

Citations

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Data Profile

The Korea National Health and Nutrition Examination Survey data linked Cause of Death data: Sungha Yun, Kyungwon Oh; Epidemiol Health. 2022;44:e2022021. Published online February 9, 2022; DOI: https://doi.org/10.4178/epih.e2022021

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751 Download
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15 Crossref

Abstract Summary PDF Supplementary Material

Abstract

The Korea National Health and Nutrition Examination Survey (KNHANES) is a national health survey that is conducted annually to assess the health and and health-related behaviors of Korean population. To utilize KNHANES data to studies of mortality risk factors, the Korea Disease Control and Prevention Agency (KDCA) constructed a database linking KNHANES data to cause-of-death statistics in Statistics Korea, made available to researchers since 2020. The KNHANES data were linked to the Cause of Death Statistics based on resident registration numbers for subjects aged 19 years or older who agreed to link the data. The linkage rate between 2007-2015 National Health and Nutrition Examination Survey and 2007-2019 Cause of Death Statistics was 97.1%. In the linked dataset, the total death rate was 6.6%, of which neoplasms accounted for the highest death rate (32.1%), followed by circulatory system disease (22.7%) and respiratory system disease (11.5%). The linked dataset was made available through the Research Data Center of the KDCA after a review of the research proposal, and will be made available after periodical updates.

Summary

Korean summary
1. 국민건강영양조사 자료가 사망 위험요인 규명 연구에 활용되도록 통계청의 사망원인통계와 연계자료 구축함 2. 2007~2015년 국민건강영양조사와 2007~2019년 사망원인통계의 연계율은 97.1%이었음 3. 국민건강영양조사-사망원인통계 연계자료는 2020년부터 연구자에게 질병관리청 내 학술연구자료처리실를 통해 제공되고 있음

Key Message
1. To utilize the Korea National Health and Nutrition Examination Survey (KNHANES) data to studies of mortality risk factors, the data were linked to the Cause of Death Statistics in the Statistics Korea. 2. The linkage rate between the 2007-2015 KNHANES and the 2007-2019 Cause of Death Statistics was 97.1%. 3. The Korea National Health and Nutrition Examination Survey data linked Cause of Death data have been provided to researchers through the Research Data Center in the Korea Disease Control and Prevention Agency (KDCA) since 2020.

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Original Articles

Trends in the prevalence and management of major metabolic risk factors for chronic disease over 20 years: findings from the 1998-2018 Korea National Health and Nutrition Examination Survey: Yoonjung Kim, Sun Jin Nho, Gyeongji Woo, Hyejin Kim, Suyeon Park, Youngtaek Kim, Ok Park, Kyungwon Oh; Epidemiol Health. 2021;43:e2021028. Published online April 19, 2021; DOI: https://doi.org/10.4178/epih.e2021028

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
We aimed to explore trends in the prevalence and management of obesity, hypertension, diabetes, and hypercholesterolemia in Korean adults from 1998 to 2018 using data from the Korea National Health and Nutrition Examination Survey (KNHANES).

METHODS

The study participants included 79,753 individuals aged ≥ 30 years who had participated in the health examination and health interview of the first (1998) to the seventh (2016-2018) KNHANES. The prevalence and management as well as annual percent change (APC) in chronic diseases were analyzed using SAS and the Joinpoint software program.

RESULTS

The prevalence of obesity in men significantly increased from 26.8% in 1998 to 44.7% in 2018 (APC= 1.9, p< 0.001), whereas that in women decreased slightly from 30.5% in 1998 to 28.3% in 2018 (APC= -0.5, p< 0.001). The prevalence of hypertension in men was 33.2% in 2018, with no significant change, whereas that in women slightly decreased to 23.1% in 2018 (APC= -0.9, p< 0.001). The prevalence of diabetes in men increased slightly from 10.5% in 2005 to 12.9% in 2018 (APC= 1.6, p< 0.001), whereas that in women remained at approximately 8%, with no significant change. The prevalence of hypercholesterolemia in both men and women increased 3-fold in 2018 (20.9% in men [APC = 8.2, p < 0.001] and 21.4% in women [APC= 7.1, p< 0.001]) compared to that in 2005. The awareness rate, treatment rate, and control rate of hypertension and hypercholesterolemia increased 2-3 fold. Regarding diabetes, the treatment rate increased, but the control rate did not change.

CONCLUSIONS

Over the past 20 years, the prevalence of obesity (in men), diabetes, and hypercholesterolemia has increased and management indicators, such as the awareness rate, treatment rate, and control rate of chronic diseases, have improved continuously.

Summary

Korean summary
국민건강영양조사(1998-2018) 자료를 활용하여 우리나라 성인의 비만, 고혈압, 당뇨병, 고콜레스테롤혈증 유병률 및 관리수준을 분석한 결과, 20년 동안 비만(남자), 당뇨병, 고콜레스테롤혈증 만성질환의 유병 수준은 악화되고 있는 반면, 만성질환의 인지율, 치료율, 치료자 중 조절률 등 관리지표는 지속적으로 개선되고 있었다.

Key Message
We examined trends in the prevalence and management of obesity, hypertension, diabetes, and hypercholesterolemia in Korean adults from the 1998-2018 Korea National Health and Nutrition Examination Survey. Over the past 20 years, the prevalence of obesity (in men), diabetes, and hypercholesterolemia has increased and management indicators, such as the awareness rate, treatment rate, and control rate of chronic diseases, have improved continuously.

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Trends in food and nutrient intake over 20 years: findings from the 1998-2018 Korea National Health and Nutrition Examination Survey: Sanghui Kweon, Jin Young Park, Myungsook Park, Yangha Kim, So Yeong Yeon, Leena Yoon, Sungha Yun, Suyeon Park, Ji Eun Yang, Youngtaek Kim, Ok Park, Kyungwon Oh; Epidemiol Health. 2021;43:e2021027. Published online April 19, 2021; DOI: https://doi.org/10.4178/epih.e2021027

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384 Download
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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
We aimed to examine the current status and trends of food and nutrient intake in the Korean population over the past 20 years using the data from the Korea National Health and Nutrition Examination Survey (KNHANES).

METHODS

We conducted a survey of 116,284 subjects over the age of one year in Korea, who participated in the KNHANES between 1998 and 2018. We collected data on the subjects’ intake for the day before using the 24-hour recall method. The annual percent change (APC) in the food groups and nutrient intake were calculated using SAS and Joinpoint software.

RESULTS

The intake of grains (APC=-0.4, p<0.05) and vegetables (APC=-0.8, p<0.05) was observed to decrease. In contrast, the intake of beverages, meat, dairy, and eggs increased. In particular, beverage intake increased by more than four times (APC=9.2, p<0.05). There was no significant change in energy intake. However, the proportion of energy intake from carbohydrates decreased by approximately 5%p (APC=-0.3, p<0.05), whereas that from fat increased by approximately 5%p (APC= 1.1, p<0.05). Additionally, there were decreases in the proportion of energy intake from breakfast and homemade meals and increases in the energy intake from snacks, dining out, and convenience food. The intake of vitamin C (APC=-3.2, p<0.05) and sodium (APC=-2.3, p<0.05) significantly decreased.

CONCLUSIONS

Over the past 20 years, there has been decreases in the intake of grains, vegetables, carbohydrates, sodium, and vitamin C and increases in the intake of beverages, dairy, meat, eggs, and fat. Since nutritional status is an important factor in the prevention and management of chronic diseases, it should be continuously monitored.

Summary

Korean summary
국민건강영양조사(1998-2018) 자료를 활용하여 우리 국민의 지난 20년간의 식품 및 영양소 섭취 현황 및 추이를 분석한 결과, 곡류, 채소류, 탄수화물, 나트륨, 비타민 C 섭취 감소, 음료류, 우유류, 육류, 난류, 지방 섭취 증가 등 식품 및 영양소 섭취에 변화가 있었다.

Key Message
We examined the current status and trends of food and nutrient intake in the Korean population using the data from the 1998-2018 Korea National Health and Nutrition Examination Survey. Over the past 20 years, there have been decreases in the intake of grains, vegetables, carbohydrates, sodium, and vitamin C and increases in the intake of beverages, dairy, meat, eggs, and fat.

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Trends in health behaviors over 20 years: findings from the 1998-2018 Korea National Health and Nutrition Examination Survey: Soyeon Kim, Sunhye Choi, Jihee Kim, Suyeon Park, Young-Taek Kim, Ok Park, Kyungwon Oh; Epidemiol Health. 2021;43:e2021026. Published online April 19, 2021; DOI: https://doi.org/10.4178/epih.e2021026

14,946 View
366 Download
28 Web of Science
23 Crossref

Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
This study aimed to examine the trends in health behaviors in Korean population using data from the Korea National Health and Nutrition Examination Survey (KNHANES).

METHODS

The subjects were 96,408 adults aged 19 years or older who participated in the first (1998) through seventh (2016-2018) KNHANES health interview. The prevalence of health behaviors (cigarette smoking, alcohol drinking, and physical activity) and annual percent change (APC) were estimated using SAS and the Joinpoint program.

RESULTS

The prevalence of current cigarette smoking in men decreased by 2.8%p (APC= -2.8, p< 0.001) annually over the 20-year period, and the prevalence of exposure to secondhand smoke at home substantially decreased compared to 2005 (APC= -8.8, p< 0.001). Compared to 2005, the prevalence of current alcohol drinking in women, but not men, increased (APC= 2.0, p< 0.001), and the prevalence of binge drinking decreased in men (APC= -0.7, p< 0.001) and increased in women (APC= 2.4, p< 0.001). The prevalence of aerobic physical activity decreased from 2014 in both gendersd (p< 0.001). The prevalence of healthy behaviors practice (non-smoking, alcohol abstinence, and aerobic physical activity) was down-trending (APC= -5.3, p< 0.001), especially among women (APC= -6.4, p< 0.001).

CONCLUSIONS

Over the past 20 years, smoking behaviors improved. However, drinking behavior was unchanged and physical activity indicators markedly decreased. More active programs are necessary for improving health behaviors, which are major risk factors linked to chronic diseases.

Summary

Korean summary
국민건강영양조사(1998-2018) 자료를 활용하여 지난 20년간 성인의 건강행태를 분석한 결과 흡연율과 간접흡연 노출률은 지속적으로 감소하였고, 신체활동 실천율 또한 감소하였다. 월간음주율과 폭음률의 경우 남자는 큰 변화가 없었던 반면 여자는 모두 증가하였다.

Key Message
This study aimed to examine the trends in health behaviors in Korean population using data from the 1998-2018 Korea National Health and Nutrition Examination Survey (KNHANES). Over the past 20 years, the prevalence of cigarette smoking and exposure to secondhand smoke in Korean adults consistently decreased, as well as the prevalence of physical activity. There was no considerable change in men, whereas in women, the prevalence of alcohol drinking and binge drinking both increased.

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Methods

Korea National Health and Nutrition Examination Survey, 20th anniversary: accomplishments and future directions: Kyungwon Oh, Yoonjung Kim, Sanghui Kweon, Soyeon Kim, Sungha Yun, Suyeon Park, Yeon-Kyeng Lee, Youngtaek Kim, Ok Park, Eun Kyeong Jeong; Epidemiol Health. 2021;43:e2021025. Published online April 19, 2021; DOI: https://doi.org/10.4178/epih.e2021025

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Abstract Summary PDF Supplementary Material

Abstract

The Korea National Health and Nutrition Examination Survey (KNHANES) was initiated in 1998 to provide evidence for the development and evaluation of health policies and programs. The Korea Disease Control and Prevention Agency is responsible for the KNHANES and has conducted it as a series of surveys. Over the past 20 years, efforts to produce accurate, timely, and nationwide health statistics have been refined by establishing a continuous annual survey system with full-time field staff, incrementally expanding survey components, collaborating with relevant academic societies for quality control, and revising the survey methods. Additionally, the utility of the collected data was increased by linking the KNHANES data with related data from other government agencies or institutions and making the overall data publicly available on the official website of KNHANES (https://knhanes.kdca.go.kr). Additional long-term plans are being developed, including plans to continue producing nationwide health indicators and invigorating the utilization of the KNHANES data.

Summary

Korean summary
국민건강영양조사는 국민건강증진법제16조에 근거하여 1998년부터 우리 국민의 건강수준, 건강행태, 식품 및 영양소 섭취 실태에 대한 국가단위 통계를 산출하는 조사사업이다. 본 연구에서는 건강지표 생산 확대, 조사 자료 활용도 향상 등 20년간의 성과를 요약하고 사회환경과 조사여건 변화를 반영한 건강통계 생산의 발전 방안을 제시하였다.

Key Message
The Korea National Health and Nutrition Examination Survey (KNHANES) is an ongoing surveillance system that was initiated in 1998 based on Ar¬ticle 16 of the National Health Promotion Act to produce nationwide statistics regarding the health status, health behaviors, and food and nutrient consumption of the Korean population. In this study, the 20-year accomplishments of the KNHANES including vigorous production of health indicators and improvement of data utilization are summarized, and future plans are presented to improve the health statistics to reflect changes in the social and survey environments.

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Original Article

Estimation and change of edentulism among the Korean population: Korea National Health and Nutrition Examination Survey 2007-2018: Na-Hyeon Yu, Ah Ra Shin, Song Vogue Ahn, Keun-Bae Song, Youn-Hee Choi; Epidemiol Health. 2021;43:e2021020. Published online April 2, 2021; DOI: https://doi.org/10.4178/epih.e2021020

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
To estimate the prevalence of edentulism according to the socio-demographic variables of Korean adults between 2007 and 2018 and to analyze the trends.

METHODS

This study was conducted using raw data from the Korea National Health and Nutrition Examination Survey (KNHANES) from 2007 to 2018. Edentulism was defined as the absence of upper and lower teeth or the retained root of the missing teeth. To obtain the prevalence of edentulism, complex sample frequency analysis and regression analysis were performed according to the socio-demographic variables to represent the national population. The Korean population structure in 2005 was exploited as a standard population to calculate age-standardized edentulism.

RESULTS

The prevalence of edentulism in 2016-2018 was 9.7% in the Korean elderly, and the change of age-standardized edentulism steadily declined over time from 2007, 12.8%. In particular, it decreased by approximately 20% in the period between 2016 and 2018 compared to that in 2007 for those in their 80s. The trend of the prevalence according to gender decreased significantly in women. According to the level of education, the greatest decrease was seen in the group with the lowest education, although the prevalence itself was higher than that seen in those who were more educated.

CONCLUSIONS

The prevalence of edentulism among the older Korean population has decreased over time. However, the concern is on those with lower education and men as these groups are still at higher risk for edentulism.

Summary

Korean summary
치아상실은 구강건강의 지표로써 현재 국외에서는 무치악 유병률 추이 파악뿐만 아니라 다국 간의 비교가 이루어지고 있지만 아시아의 주요국가 중 하나인 한국의 무치악 유병률 추이에 대해서는 아직 연구되지 않았다. 연구 결과, 2016-2018년 한국 노인의 무치악 유병률은 9.72%였으며, 연령표준화된 무치악 유병률의 변화는 2007 년 12.8 %에서 꾸준히 감소했다. 결론적으로 무치악으로 어려움을 겪을 수 있는 교육수준이 낮은 노인과 남성에 대해선 지속적인 관심이 필요하다.

Key Message
Tooth loss is an indicator of oral health. At present, not only the trend of edentulous prevalence is being identified abroad, but also multi-country comparisons are being made, but the trend of edentulous prevalence in Korea, one of the major Asian countries, has not been studied. As a result of the study, the prevalence of edentulous in Korea in 2016-2018 was 9.72%, and the change in the age-standardized edentulous prevalence steadily decreased from 12.8% in 2007. In conclusion, continuous attention is needed for the elderly and men with low educational standards who may suffer from edentulous.

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Data Profile

Establishment of the Korea National Health and Nutrition Examination Survey air pollution study dataset for the researchers on the health impact of ambient air pollution: Myung-Jae Hwang, Jisun Sung, Miryoung Yoon, Jong-Hun Kim, Hui-Young Yun, Dae-Ryun Choi, Youn-Seo Koo, Kyungwon Oh, Sungha Yun, Hae-Kwan Cheong; Epidemiol Health. 2021;43:e2021015. Published online February 8, 2021; DOI: https://doi.org/10.4178/epih.e2021015

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Abstract

To provide a nationwide representative dataset for the study on health impact of air pollution, we combined the data from the Korea National Health and Nutrition Examination Survey with the daily air quality and weather data by matching the date of examination and the residential address of the participants. The database of meteorological factors and air quality as sources of exposure data were estimated using the Community Multiscale Air Quality model. The linkage dataset was merged by three ways; administrative district, <i>si-gun-gu</i> (city, county, and district), and geocode (in latitude and longitude coordinate units) based on the participants’ residential address, respectively. During the study period, the exposure dataset of 85,018 individuals (38,306 men and 46,712 women) whose examination dates were recorded were obtained. According to the definition of exposure period, the dataset was combined with the data on short-term, mid-term, and long-term exposure to air pollutants and the meteorological indices. Calculation of the daily merged dataset’s average air pollution linked by <i>si-gun-gu</i> and geocode units showed similar results. This study generated a daily average of meteorological indices and air pollution exposure dataset for all regions including rural and remote areas in Korea for 11 years. It is expected to provide a platform for the researchers studying the health impact of air pollution and climate change on the representative population and area, which may facilitate the establishment of local health care plans by understanding the residents’ health status at the local as well as national level.

Summary

Korean summary
-2007년부터 2017년까지 11년간 국민건강영양조사의 검진조사 대상자의 검진일자와 지리정보를 기준으로 85,018명에 대해 기상 및 대기오염 모델링 자료를 결합하여 조사 대상자의 거주지주소를 이용하여 시·군·구 단위와 주소 기반 위경도 좌표를 기준으로 각각 노출자료를 결합함. -대기오염의 단기노출, 중기노출, 장기노출의 건강영향을 평가하기 위해 지연효과(lag effect)를 적용하여 각 건강자료와 결합함. -기상 및 대기오염 모델링 자료와 연계된 국민건강영양조사의 활용을 위한 data profile을 제시함.

Key Message
-We built a dataset for air pollution research by combining meteorological and air pollution modeling data through CMAQ for 85,018 individuals based on the date of examination and geographic information of the Korea National Health and Nutrition Examination Survey participants for 11 years, from 2007 to 2017. -Each exposure data was combined based on si-gun-gu (city, county, and district) and geocode (in latitude and longitude coordinate units) based on the participants’ residential address. -To evaluate the health effects of short-, medium- and long-term air pollution exposure, the lag values of days, months, and years was applied and combined with each health data. -A data profile was presented for the Korea National Health and Nutrition Examination Survey linked to meteorological and air pollution modeling data.

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Original Articles

Associations between socioeconomic status and blood cadmium levels in Korea: Yongho Jee, Sung-il Cho; Epidemiol Health. 2019;41:e2019018. Published online May 15, 2019; DOI: https://doi.org/10.4178/epih.e2019018

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Abstract Summary PDF

Abstract

OBJECTIVES
Although smoking is associated with both low socioeconomic status and blood cadmium (Cd) levels, the association between socioeconomic status and Cd levels remains unclear. Therefore, our study aimed to examine this association and to clarify whether smoking is a confounding or mediating variable in this relationship.

METHODS

Data (n=7,734) were drawn from the Korea National Health and Nutrition Examination Survey (KNHANES, 2008- 2011), including years that contained data on blood Cd and urinary cotinine levels. We investigated the associations of income, education, and occupation with blood Cd levels. Smoking was investigated by categorizing participants by smoking status (never, former, and current) and pack-years into quartiles. The weekly frequency of rice and barley intake was analyzed to gain insights into participants’ dietary patterns. Additionally, urinary cotinine levels were used to ensure the validity of the smoking variables.

RESULTS

Participants earning a low income and with less formal education had higher blood Cd levels. After controlling for smoking, the association between income and Cd levels substantially weakened. Further controlling for education, the association between income and Cd levels disappeared. However, there was a strong negative association between education and Cd levels, even after controlling for smoking history, pack-years, and urinary cotinine levels.

CONCLUSIONS

In cross-sectional data from the KNHANES, blood Cd levels were significantly higher among those with a low income and less formal education. Smoking history contributed to, but did not fully explain, these associations.

Summary

Korean summary
흡연은 낮은 사회경제적 상태와, 높은 혈중 카드뮴 상태 등과 관련이 있다고 보고가 되어 왔지만, 사회경제적 상태와 혈중 카드뮴 상태의 연관성은 불분명하다. 따라서, 본 연구는 혈중 카드뮴 농도와 사회경제적 상태와의 관련성을 분석하고, 흡연이라는 변수가 이 관련성에 어떠한 영향을 주는지 보고자 하였다.

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Comparison of estimates and time series stability of Korea Community Health Survey and Korea National Health and Nutrition Examination Survey: Ji Son Ki, Ho Kim; Epidemiol Health. 2019;41:e2019012. Published online April 7, 2019; DOI: https://doi.org/10.4178/epih.e2019012

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
In South Korea, there are two nationwide health surveys conducted by the Korea Centers for Disease Control and Prevention: the Korea Community Health Survey (KCHS) and Korea National Health and Nutrition Examination Survey (KNHANES). The two surveys are directly comparable, as they have the same target population with some common items, and because both surveys are used in various analyses, identifying the similarities and disparities between the two surveys would promote their appropriate use. Therefore, this study aimed to compare the estimates of six variables in KCHS and eight variables in KNHANES over a six-year period and compare time series stability of region-specific and sex- and age-specific subgroup estimates.

METHODS

Data from adults aged 19 years or older in the 2010-2015 KCHS and KNHANES were examined to analyze the differences of estimates and 95% confidence interval for self-rated health, current smoking rate, monthly drinking rate, hypertension diagnosis rate, diabetes diagnosis rate, obesity prevalence, hypertension prevalence, and diabetes prevalence. The variables were then clustered into subgroups by city as well as sex and age to assess the time series stability of the estimates based on mean square error.

RESULTS

With the exception of self-rated health, the estimates taken based on questionnaires, namely current smoking rate, monthly drinking rate, hypertension diagnosis rate, and diabetes diagnosis rate, only differed by less than 1.0%p for both KCHS and KNHANES. However, for KNHANES, estimates taken from physical examination data, namely obesity prevalence, hypertension prevalence, and diabetes prevalence, differed by 1.9-8.4%p, which was greater than the gap in the estimates taken from questionnaires. KCHS had a greater time series stability for subgroup estimates than KNHANES.

CONCLUSIONS

When using the data from KCHS and KNHANES, the data should be selected and used based on the purpose of analysis and policy and in consideration of the various differences between the two data.

Summary

Korean summary
본 연구는 지역사회건강조사와 국민건강영양조사의 2010년부터 2015년까지 6년간의 자료로 각각 6개, 8개 변수의 추정치를 비교하였다. 설문변수 간의 추정치 차이보다 설문변수와 검진변수간의 추정치의 더 차이가 컸고 하위그룹별 시계열 변동은 지역사회건강조사가 더 안정적이었다.

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Cancer screening rate in people with diabetes in the Korean population: results from the Korea National Health and Nutrition Examination Survey 2007-2009: Kumban Walter Chuck, Minji Hwang, Kui Son Choi, Mina Suh, Jae Kwan Jun, Boyoung Park; Epidemiol Health. 2017;39:e2017036. Published online August 10, 2017; DOI: https://doi.org/10.4178/epih.e2017036

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Abstract Summary PDF

Abstract

OBJECTIVES
To investigate the screening rates for gastric, breast, and cervical cancer in people with diabetes compared with people without diabetes.

METHODS

Data from the Korea National Health and Nutrition Examination Survey (2007-2009) were used. Cancer-free men who were 40 years old and over and cancer-free women who were 30 years old and over were included. The lifetime screening rate and regular screening rate were compared in people with and without diabetes.

RESULTS

Fewer people with diabetes than people without diabetes had ever received cancer screening (53.5 vs. 59.5%, p<0.001 for gastric cancer; 60.5 vs. 71.5%, p<0.001 for breast cancer; and 49.1 vs. 59.6%, p<0.001 for cervical cancer). Fewer people with diabetes than people without diabetes received the recommended screenings for gastric cancer (38.9 vs. 42.9%, p<0.001), breast cancer (38.8 vs. 44.6%, p<0.001), and cervical cancer (35.1 vs. 51.2%, p<0.001). In subgroup analyses according to socioeconomic factors, the lifetime and recommended screening rates were lower in the diabetic population in most socioeconomic subgroups. In the multivariate analysis adjusted for socioeconomic factors, people with diabetes showed lower lifetime screening rates for gastric and cervical cancer (odds ratio [OR], 0.8; 95% confidence interval [CI], 0.7 to 0.9 and OR, 0.7; 95% CI, 0.6 to 0.9), and lower regular screening rates for breast and cervical cancer (OR, 0.7; 95% CI, 0.6 to 0.9 and OR, 0.7; 95% CI, 0.5 to 0.9).

CONCLUSIONS

The cancer screening rate in people with diabetes was lower than in people without diabetes. Considering the higher cancer risk in people with diabetes, efforts to increase the screening rate in this high-risk population should be implemented.

Summary

Korean summary
기존의 여러 연구에서 당뇨병이 있는 사람에서 당뇨병이 없는 경우에 비해 암 발생의 위험이 증가하는 것이 확인되었다. 본 연구에서 당뇨병이 있는 사람과 없는 사람에서 암 수검률을 비교했을 때, 당뇨병이 있는 사람의 위암, 유방암, 자궁경부암의 평생 수검률과 권고안 이행 수검률은 모두 낮았다. 당뇨병 환자가 암 발생의 고위험군임을 고려하였을 때 이들을 대상으로 암 검진 수검률을 높이려는 노력이 필요하다.

Citations

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Emmanuel Perrodin-Njoku, Sowmya Rao, Regina Wang, Christopher Moreland, Poorna Kushalnagar
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Soonsu Shin, Min‐Ho Kim, Chang‐Mo Oh, Eunhee Ha, Jae‐Hong Ryoo
Diabetes/Metabolism Research and Reviews.2024;[Epub] CrossRef
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Changes in seroprevalence of hepatitis B surface antigen and epidemiologic characteristics in the Republic of Korea, 1998-2013: Hyerin Lee, Hyungmin Lee, Yumi Cho, Kyungwon Oh, Moran Ki; Epidemiol Health. 2015;37:e2015055. Published online December 23, 2015; DOI: https://doi.org/10.4178/epih/e2015055

16,635 View
252 Download
13 Web of Science
9 Crossref

Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
This study investigated changes in hepatitis B seroprevalence from 1998 to 2013, and to identify differences in epidemiologic characteristics between hepatitis B surface antigen (HBsAg)-positive and HBsAg-negative people.

METHODS

HBsAg seropositive rates were compared by year, sex, and age using the blood test data from the periods I to VI (1998-2013) of the Korea National Health and Nutrition Examination Survey. Interviews and self-administered surveys were conducted to collect data on health behavior, quality of life, comorbidities, and health care utilization.

RESULTS

HBsAg seropositive rates in the Republic of Korea decreased from 4.6% in 1998 to 2.9% in 2008, and then remained the same for the next five years. While seropositive rates by age were the highest at 35 to 39 years of age in 1998, it peaked at 50 to 54 years of age in 2013. HBsAg-positive people showed high values from two liver function tests, including glutamic-oxaloacetic transaminase and glutamic-pyruvic transaminase, and the prevalence rates of liver cirrhosis and liver cancer were also significantly high. Indices for health behavior and quality of life showed no significant differences between HBsAg-positive and HBsAg-negative people.

CONCLUSIONS

While HBsAg seropositive rates tended to decline after 1998, there have been no significant changes over the most recent five years. We should focus on treatment of existing hepatitis B patients along with immunization programmes to prevent new hepatitis B infections. In addition, it may be necessary to encourage HBsAg-positive people to follow healthier life-styles in order to prevent further progression of hepatitis B to liver cirrhosis and liver cancer.

Summary

Korean summary
한국 국민건강영양조사 자료로 본 HBsAg 양성률은 1998 년 4.6%에서 2008 년에 2.9%로 감소한 이후 5 년간 증감없이 2013 년에 2.9%로 나타났다. 한국 HBsAg 양성률을 더욱 감소시키기 위해서는 예방접종사업뿐 아니라 B형 간염 환자 치료를 보다 적극적으로 해야 될 것으로 보인다. 또한 HBsAg 양성자는 간경화나 간암 예방을 위해 건강한 생활습관을 가지도록 노력하는 것이 필요하다.

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