Epidemiology and Health

Dong Hyun Kim

7 Articles

Related Factors with Decreased Physical Function in the Community-Dwelling Elderly in Chuncheon: Hallym Aging Study(HAS).: Sun Ae Jeon, Jin Young Jeong, Seok Won Park, Young Ho Choi, Moon Gi Choi, Kyung Soon Hong, Sang Kon Lee, Hyun Ah Kim, Dong Hyun Kim; Korean J Epidemiol. 2008;30(2):216-229. Published online December 31, 2008; DOI: https://doi.org/10.4178/kje.2008.30.2.216

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Abstract

This study was conducted to elucidate the related factors with the decreased physical function in the community- dwelling elderly in Chuncheon. We used data obtained from Hallym Aging Study(HAS) from January to May in 2007. The participants were 505 elderly aged 65 years or over after excluding those who didn't complete physical function test and aged < 65. The measurement of physical function was based on the "Health Aging and Body Composition Study Physical Performance Battery(H-ABC PPB)" that included semi-tandem stance, tandem stance, single leg stance, 6m general walk, 6m narrow walk, and chair stand test. And we also included grip strength test. Overall physical function based on H-ABC PPB decreased with age in both men and women. Smoking appeared to increase the risk of decreased function of chair stand in women (adjusted OR=3.8, 95% CI=1.2-12.6). Regular exercise was found to reduce the risk of decreased physical function in both men(Balance OR=0.5, 95% CI=0.2-1.0; Usual walk OR=0.4, 95% CI=0.2- 0.9) and women(Balance OR=0.4, 95% CI=0.2-1.0; Usual walk OR=0.3, 95% CI=0.1- 0.9); Narrow walk OR=0.2, 95% CI=0.1-0.8). Higher level of education seemed to be associated with higher functional performance. It needs further researches on the effect of education on the physical function of the elderly in this population.

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Comparison of intradialytic neuromuscular electrical stimulation and oral nutritional supplements in hemodialysis patients: study protocol for a multicenter, parallel-group, randomized controlled trial in Korea
Mi-yeon Yu, Jae Hyeon Park, Yong Chul Kim, Jae Yoon Park, Ran-hui Cha
Trials.2021;[Epub] CrossRef
A First-year Cohort Study based on Health Behaviors of Older Adults in an Urban City: Gender and Age Differences
Ji Yeon Ha, Belong Cho, Misoon Song, Jaeyoung Lim, Ga Hye Kim, Young-soon Jung, Yeon-Hwan Park
Korean Journal of Adult Nursing.2017; 29(5): 505. CrossRef

Association of obesity indices with physiological markers for cardiovascular disease among middle age and elderly in Chuncheon : Hallym Aging Study: Jin Young Jeong, Jeong Hun Kim, Young Ho Choi, Soong Nang Jang, Yong Jun Choi, Dong Hyun Kim; Korean J Epidemiol. 2008;30(1):89-99. Published online June 30, 2008; DOI: https://doi.org/10.4178/kje.2008.30.1.89

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Abstract

PURPOSE
This study was performed to evaluate association of obesity indices with physiological markers for cardiovascular disease(CVD) in community dwelling middle aged and elderly populations.

METHODS

We evaluated cross-sectional association of obesity indices with physiological markers for CVD using the data of Hallym Aging Study(HAS) conducted in 2004. Information on general characteristics and medical histories were collected by trained interviewers. Also obesity indices including waist circumference(WC), waist to hip ratio(WHR), body mass index(BMI), and body fat mass(BFM), and physiological markers of CVD including systolic blood pressure(SBP), diastolic blood pressure(DBP), triglyceride(TG), high density lipoprotein cholesterol(HDL-C), total cholesterol(TC), and fasting blood sugar(FBS) were measured by clinical staffs. 589 out of the 922 participated in HAS were enrolled in the final analysis, excluding 333 who had been diagnosed and medicated due to obesity-related diseases. Age and gender specific correlation coefficients between obesity indices and physiological markers for CVD were calculated by partial spearman correlations using SAS ver 9.1.

RESULTS

The strength of correlation of obesity indices and physiological markers of CVD changed with age. The correlations between SBP, DBP, TG and HDL-C and obesity indices were attenuated with age, whereas those of TC, FBS and LDL-C were increased among the elderly. These patterns were similar in both gender.

CONCLUSIONS

These findings show that more appropriate obesity indices according to age are needed to evaluate the association between these indices and CVD risks.

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What is the Most Reliable Obesity Iindex in Korean Elderly Population?
June Hyung Yoon, Jongwoo Kim, Seon Yeong Lee, Kyunam Kim, In Young Cho, Young M Cho
The Korean Journal of Obesity.2012; 21(3): 140. CrossRef

Development of Risk Prediction Model for Cardiovascular Disease Using Intima Media Thickness of Carotid Artery Among Community-Dwelling Elderly.: Jin Young Jeong, Kyung Soon Hong, Soong Nang Jang, Young Ho Choi, Moon Gi Choi, Sang Kon Lee, Hyun Ah Kim, Seok Won Park, Na Rae Hong, Dong Hyun Kim; Korean J Epidemiol. 2007;29(2):187-199.

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Abstract PDF: Abstract
PURPOSE
This study was performed to develop risk prediction model for cardiovascular disease using intima-media thickness (IMT) of carotid artery among the community dwelling elderly.
METHODS
Follow-up survey was conducted in 2007 to measure the IMT of carotid artery, which is known as a preclinical marker of atherosclerotic change, among participants at the baseline survey of Hallym Aging Study (HAS) in 2004. They were categorized into two groups; increased IMT > or = 0.9 mm and normal IMT < 0.9 mm. To evaluate which factors are independently related with the increased IMT, multiple logistic regression analysis was done. Based on the regression coefficients of these factors weighed by the magnitude of the effect estimates, we calculated the risk scores for increased IMT for every participants. ROC curve was plotted for the each cutoff point of risk scores and its fitness was tested using Area Under the Curve (AUC). Finally, we calculated risk ratios for the increased IMT according to the level of risk based on the risk scores.
RESULTS
Several factors were found as related factors for the increased IMT in the multiple logistic regression: age (beta=0.15), cholesterol (beta=0.01), insulin (beta=0.13), and pulse pressure (beta=0.90) for men, and age (beta=0.08), family history of diabetes mellitus (beta=0.94) and stroke (beta=0.79), alcohol drinking (beta=0.39), and high cholesterol (beta=0.77) for women. We assigned the weighed value for each factors. The average risk scores were 14.48 (range 9.69-18.76) for men and 4.59 (range 2.41-7.48) for women. The Area Under the Curve (AUC) were 0.77 for men and 0.71 for women. We also observed the higher risk of increased IMT as the risk scores increased.
CONCLUSION
Based on the results, we expect to predict the level of the risk for the increased IMT, which is preclinical marker for atherosclerotic change, among the elderly.; Summary

A study on the addicted use of mobile phone among the high school students.: Jin young Jeong, Dong Hyun Kim; Korean J Epidemiol. 2005;27(1):140-153.

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BACKGROUND
As there are many teenagers being addicted to the Internet ever since the computer became one of the communication channels, similar addictive phenomena are expected to occur for mobile phone usage as it rapidly positions itself as a means of communication among teenagers. OBJECTIVE: This study was performed to describe the pattern of mobile phone usage among high school students and to examine the association with psychological characteristics related to addiction such as depression, self-esteem and impulsiveness.
METHOD
OLOGY: A survey was conducted for 501 high school students(254 males and 247 females), currently using mobile phones, in the Metropolitan Seoul area. The Questionnaire by Young for the evaluation of internet addiction was modified and supplemented incorporating the circumstances in Korea. For the psychological characteristics, following were used: Korean translation of the depression scale CES-D, the self-esteem scale and Barratt Impulsiveness Scale. Based on the total score on the mobile phone survey, the top 25% were categorized as the addicted user group (n=129) and the bottom 25% as the non-addicted user group(n=126).
RESULTS
The addicted user group started using the mobile phone earlier, used their phones for longer durations and displayed higher purchasing frequencies than the non-addicted user group. Furthermore, the addicted group members scored higher in terms of average daily usage time, voice call duration, SMS exchanges, the number of contacts stored in the phone, experiences of using the phone during classes, and average monthly charges. Multiple logistic regression analysis was performed to assess associated factors of addicted mobile phone use. In terms of psychological characteristics, addicted mobile phone use was 10.2 times(OR=10.2, 95% CI 2.1~49.2) greater if the depression point is 51 or higher compared to 35 or less, and 6.3 times(OR=6.4, 95% CI 2.0~20.5) greater if the impulsiveness point is 61 or higher compared to 50 or less.
CONCLUSION
These finding showed that there were differences between the addicted mobile phone user group and the non-addicted counterpart in terms of mobile phone usage patterns and psychological characteristics such as depression and impulsiveness. Further studies on the association between addicted use of mobile phone and psychological factors are needed.; Summary

The Association of Reproductive and Menstrual Factors and Colon and Rectal Cancer Risk in Korean Women.: Bong Wha Lee, Dong Hyun Kim, Hunjae Lee, Dae Yong Whang, Yoon Ok Ahn; Korean J Epidemiol. 2002;24(1):76-82.

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Recently, there were several epidemiological studies demonstrating that reproductive and menstrual factors are associated with the risk of colorectal cancer in women. A hospital-based case-control study has been conducted to investigate whether the histories of childbearing, menstruation, and breast-feeding are associated with colorectal cancer risk. The cases were consecutively diagnosed, histologically confirmed, incident patients with cancers of the colon and rectum aged 30-79 who were admitted to three tertiary hospitals in Seoul, Korea between March 1995 and August 1997. Controls were selected in the same hospitals as the cases during the same periods. Finally, a total of 151 cases and 110 controls were selected and interviewed on their reproductive and menstrual characteristics using a structured questionnaire. Earlier age at first birth appears to be related with increased risk of colorectal cancer (multivariate relative risk[RR] of colorectal cancer for <21 vs 25 > or = 2.33; 95% confidence interval[CI] 1.1-5.1, p for trend 0.03). Compared with women who experienced menarche at age 16 or older, women whose menarche occurred at age 14 or less appeared at significantly higher risk of rectal cancer(multivariate RR of colorectal cancer for < or = 14 vs > or =16 = 2.26; 95% CI 1.0-3.4, p for trend 0.03). We found no associations for parity, incomplete pregnancies, menopause, use of oral contraceptives, and hormone replacement therapy. These findings suggest that events of reproductive life may have a bearing on female subsequent risk of colon and rectal cancer; Summary

Methodologic Considerations on the Cohort Study of Risk Factors of Stomach Cancer: On the Incompleteness of Case Ascertainment.: Moo Song Lee, Wee Chang Kang, Dong Hyun Kim, Jong Myun Bae, Myung Hee Shin, Young Jo Lee, Yoon Ok Ahn; Korean J Epidemiol. 1997;19(2):152-160.

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BACKGROUND
AND PURPOSE: The authors conducted the study to evaluate the incompleteness of follow-up as well as the validity of the diagnostic code in the medical insurance databases in a cohort study. They also suggested several useful regression models for the analysis of such incomplete data.
METHODS
The subjects of Seoul Cohort(n=14,533) were followed up for three and a half years. Based on the chart reviews of the subjects who had the diagnostic code of gastric cancer in the medical insurance databases, forty-four cases of gastric cancer were idenfified, using cancer registry databases and death certificates as the secondary source. Regression coefficients and the associated p-values were estimated using the following six methods and the results were compared with each other. Method 1: The subjects with the diagnostic code in the medical insurance databases were considered as the cases of gastric cancer.
Method
2: The confirmed cases were considered as the cases of gastric cancer. Method 3: The cases were the subjects with the diagnositc code whose diagnosis was confirmed by medical chart reriew. Method 4: Ordinal logistic regression.
Method
5: Weighted logistic regression. Method 6: Polytomous logistic regression RESULTS: A total of 12,541 subjects were followed up excluding censored cases. One hundred and nine subjects were diagnosed with gastric cancer in the medical utilization databases: forty-three were probable cases whose dianosis was not confrimed by chart review, twenty-six were ruled out and 26 were confirmed cases. Another 14 cases were confirmed using the cancer registry and death certificates. Using the secondary sources, four another cases were confirmed and 44 cases were confirmed during follow-up. In method 1, past history of gastritis and gastric ulcer was significant risk factor whereas intake frequency of fresh vegetable, ice cream and coffee was associated with significantly decreased risk. In the second and the sixth method, green tea was a significant protective factor, whereas in methods 3-5, no significant variables were found.
CONCLUSIONS
Polytomous logistic regression was the preferred method in the cohort study using secondary sources of information for the follow-up, and it provided additional information for the risk factor identification, especially for the specificity of the risk factors.; Summary

Correlation study on foods/nutrients intake and the mortality and the morbidity of carcers of stomach and colorectum in Korea.: Myong Kyun Cynn, Dong Hyun Kim, Keun Young Yoo; Korean J Epidemiol. ;15(2):119-131.

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Chronological correlation analysis studies with 10 to 12 years lag period between various foods/nutrients intakes and mortalities of gastro-intestinal cancers such as stomach cancer, colorectal cancer in Korea were performed to investigate the effect of dietary factors on carcinogenesis. Information on the foods/nutrients intake from 1969 to 1988 were obtained from National Nutritional Survey Report published annually by Ministry of Health and Social Affairs. Data on the death due to stomach and colorectal cancers between 1981 and 1990 were gathered from Annual report on the cause of death statistics, National Stati Stical Office and Data on the morbidity from Medical insurance statistical yearbook, Korea Medical Insurance Corporation. Since 1969, the intakes of total energy and cereals which is a major supplier of carbohydrate have gradually decreased, whereas, those of total protein, protein from animal sources, lipid have remarkably increased in recent years. While the mortality from stomach cancer has increased upto 1984, and then decreased steadily for male and female, that of coloncancer has increased continuously during this period. The mortality of male stomach cancer has correlated only with niacin among various nutrients. There appears to be no good, correlating food group or nutrient found whth mortalities; Summary

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