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Trends in general and abdominal obesity among Korean adults: findings from 1998, 2001, 2005, and 2007 Korea National Health and Nutrition Examination Surveys.

Khang YH, Yun SC - J. Korean Med. Sci. (2010)

Bottom Line: Among women aged 20-39, the prevalence of underweight increased significantly between 1998 and 2007, and BMI showed a decreasing tendency.In conclusion, policy efforts to abate overweight and obesity trends need to be exercised among men and older women.In addition, more national studies regarding potential increases in underweight among young women are warranted.

View Article: PubMed Central - PubMed

Affiliation: Department of Preventive Medicine, University of Ulsan College of Medicine, Seoul, Korea. youngk@amc.seoul.kr

ABSTRACT
We examined trends in obesity among Korean adults, using body mass index (BMI) and waist circumference (WC) as reported in national surveys. Data (10,043 men and 12,758 non-pregnant women) were derived from four waves of the Korea National Health and Nutrition Examination Survey conducted in 1998, 2001, 2005, and 2007. Between 1998 and 2007, the distribution of BMI and WC showed shifts toward the right among men. Mean values of BMI and WC and the corresponding overweight (includes obesity) and obesity prevalences showed increasing trends in men but not in women. Women aged 60+ showed significant increases in obesity measures, including mean BMI and WC, and the associated prevalences. Among women aged 20-39, the prevalence of underweight increased significantly between 1998 and 2007, and BMI showed a decreasing tendency. These time trends in young women were the reverse of the trends in young men. In conclusion, policy efforts to abate overweight and obesity trends need to be exercised among men and older women. In addition, more national studies regarding potential increases in underweight among young women are warranted.

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Related in: MedlinePlus

Changes in the distribution of body mass index (kg/m2) and waist circumference (cm) between 1998 and 2007 Korea National Health and Nutrition Examination Survey data among men and women aged 20+.
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Figure 1: Changes in the distribution of body mass index (kg/m2) and waist circumference (cm) between 1998 and 2007 Korea National Health and Nutrition Examination Survey data among men and women aged 20+.

Mentions: Using the R statistical programming language, we presented figures for the distribution of BMI and WC by year, which reveals shifts in obesity measures (Fig. 1). In addition, we employed quantile regression analysis (17) with the R quantreg package to describe age-specific time trends in obesity measures (Fig. 2). Quantile regression is a type of regression analysis that approximates either the median or other quantiles of continuous variables. This quantile regression analysis can allow us to examine time trends of certain percentile points as well as median values in the BMI and WC distribution. In this study, we presented the age-specific changes at the 15th, 50th, and 85th percentiles. Using SAS (SAS Institute Inc., Cary, NC, USA), we also presented changes in the age-adjusted least square mean and standard error of obesity measures and P values for time trends, using regression analysis (PROC SURVEYREG in SAS) after taking account of primary sampling units, stratification, and sample weights for K-NHANES. To present changes in the age-adjusted prevalence of underweight, overweight (includes obesity), and obesity, we employed the direct standardization method with the 2005 Korean Census population as the standard population. Sample weights from the K-NHANES were also considered in this standardization. We used logistic regression (PROC SURVEYLOGISTIC in SAS) to test time trends of the age-adjusted prevalences after taking account of primary sampling units, stratification, and sample weights from the K-NHANES.


Trends in general and abdominal obesity among Korean adults: findings from 1998, 2001, 2005, and 2007 Korea National Health and Nutrition Examination Surveys.

Khang YH, Yun SC - J. Korean Med. Sci. (2010)

Changes in the distribution of body mass index (kg/m2) and waist circumference (cm) between 1998 and 2007 Korea National Health and Nutrition Examination Survey data among men and women aged 20+.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2966994&req=5

Figure 1: Changes in the distribution of body mass index (kg/m2) and waist circumference (cm) between 1998 and 2007 Korea National Health and Nutrition Examination Survey data among men and women aged 20+.
Mentions: Using the R statistical programming language, we presented figures for the distribution of BMI and WC by year, which reveals shifts in obesity measures (Fig. 1). In addition, we employed quantile regression analysis (17) with the R quantreg package to describe age-specific time trends in obesity measures (Fig. 2). Quantile regression is a type of regression analysis that approximates either the median or other quantiles of continuous variables. This quantile regression analysis can allow us to examine time trends of certain percentile points as well as median values in the BMI and WC distribution. In this study, we presented the age-specific changes at the 15th, 50th, and 85th percentiles. Using SAS (SAS Institute Inc., Cary, NC, USA), we also presented changes in the age-adjusted least square mean and standard error of obesity measures and P values for time trends, using regression analysis (PROC SURVEYREG in SAS) after taking account of primary sampling units, stratification, and sample weights for K-NHANES. To present changes in the age-adjusted prevalence of underweight, overweight (includes obesity), and obesity, we employed the direct standardization method with the 2005 Korean Census population as the standard population. Sample weights from the K-NHANES were also considered in this standardization. We used logistic regression (PROC SURVEYLOGISTIC in SAS) to test time trends of the age-adjusted prevalences after taking account of primary sampling units, stratification, and sample weights from the K-NHANES.

Bottom Line: Among women aged 20-39, the prevalence of underweight increased significantly between 1998 and 2007, and BMI showed a decreasing tendency.In conclusion, policy efforts to abate overweight and obesity trends need to be exercised among men and older women.In addition, more national studies regarding potential increases in underweight among young women are warranted.

View Article: PubMed Central - PubMed

Affiliation: Department of Preventive Medicine, University of Ulsan College of Medicine, Seoul, Korea. youngk@amc.seoul.kr

ABSTRACT
We examined trends in obesity among Korean adults, using body mass index (BMI) and waist circumference (WC) as reported in national surveys. Data (10,043 men and 12,758 non-pregnant women) were derived from four waves of the Korea National Health and Nutrition Examination Survey conducted in 1998, 2001, 2005, and 2007. Between 1998 and 2007, the distribution of BMI and WC showed shifts toward the right among men. Mean values of BMI and WC and the corresponding overweight (includes obesity) and obesity prevalences showed increasing trends in men but not in women. Women aged 60+ showed significant increases in obesity measures, including mean BMI and WC, and the associated prevalences. Among women aged 20-39, the prevalence of underweight increased significantly between 1998 and 2007, and BMI showed a decreasing tendency. These time trends in young women were the reverse of the trends in young men. In conclusion, policy efforts to abate overweight and obesity trends need to be exercised among men and older women. In addition, more national studies regarding potential increases in underweight among young women are warranted.

Show MeSH
Related in: MedlinePlus