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KMID : 1155220170420030241
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Journal of the Korean Society of Health Information and Health Statistics
2017 Volume.42 No. 3 p.241 ~ p.249
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Accuracy of Self-reported Height, Weight and Body Mass Index in Community Health Survey in South Korea
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Jeong Jin-Young
Kim Dong-Hyun
Kim Keon-Yeop
Ryu So-Yeon
Lee Soon-Young
Park Yong-Soon
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Abstract
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Objectives: The purpose of this study is to check accuracy of height, weight and body mass index (BMI) and to verify usefulness of the obesity rate based on the self-reported height and weight.
Method: Self-reported height and weight values of those who took part in the 2016 Community Health Survey in 3 areas (2,198 persons) were investigated and measured. The mean difference between the self-reported and the measured height, weight and BMI was estimated with paired t-test and the Pearson correlation coefficient. Percent agreement (%) and Kappa Statistics of BMI were calculated per group (<18.5, 18.5-24.9, 25-29.9, ≥30) and validity (sensitivity, specificity and predictive factor) of the self-reported obesity rate (BMI ≥25) was estimated.
Results: The mean values between the self-reported and the measured values were compared, and it was found that height was over-reported, weight and BMI was under-reported (p<0.05). The correlation coefficient between the height, weight and BMI was all 0.9 or higher (p<0.05). When it comes to the mean difference in height and weight per group (4 groups), both sexes in height group 4 under-reported the height and male in weight group 1 over-reported the weight. BMI % agreement per BMI group was 88.3% in male and 85.4% in female, and Kappa Statistics was 0.779 (95% CI, 0.76-0.80) in male and 0.673 (95% CI, 0.65-0.70) in female. The sensitivity of self-reported BMI based on BMI 25 was 82.7% in male and 67.8% in female, showing a higher value in male. Obesity prevalence based on the self-reported values was 87.1% and 71.3% of that based on the measured values in male and female respectively, and it got lower among elderly people who are 60 years old or more.
Conclusions: In community-based epidemiological studies, height, weight, and obesity rate should be compared and evaluated based on measurement data.
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KEYWORD
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Self-reported height, Self-reported weight, Body mass index, Anthropometry, Accuracy
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