Department of Foods and Nutrition, Kookmin University, 861-1, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea.
Nutr Res Pract. 2013 Aug;7(4):326-9. doi: 10.4162/nrp.2013.7.4.326. Epub 2013 Aug 7.
Height and weight are important indicators to calculate Body Mass Index (BMI); measuring height and weight directly is the most exact method to get this information. However, it is ineffective in terms of cost and time on large population samples. The aim of our study was to investigate the validity of self-reported height and weight data compared to our measured data in Korean children to predict obese status. Four hundred twenty-two fifth-grade (mean age 10.5 ± 0.5 years) children who had self-reported and measured height and weight data were final subjects for this study. Overweight/obese was defined as a BMI of or above the 85th percentile of the gender-specific BMI for age in the 2007 Korean National Growth Charts or a BMI of 25 or higher (underweight : < 5th, normal : ≥ 5th to < 85th, overweight : ≥ 85th to < 95th). The differences between self-reported and measured data were tested using paired t-test. Differences based on overweight/obese status were tested using analysis of variance (ANOVA) and linear trends. Pearson's correlation and Cohen's kappa were tested to examine agreements between the self-reported and measured data. Although measured and self-reported height, weight and BMI were significantly different and children tended to overreport their height and underreport their weight, the correlation between the two methods of height, weight and BMI were high (r = 0.956, 0.969, 0.932, respectively; all P < 0.001), and both genders reported their overweight/non-overweight status accurately (Cohen's kappa = 0.792, P < 0.001). Although there were differences between the self-reported and our measured methods, the self-reported weight and height was valid enough to classify overweight/obesity status correctly, especially in non-overweight/obese children. Due to bigger underestimation of weight and overestimation of height in obese children, however, we need to be aware that the self-reported anthropometric data were less accurate in overweight/obese children than in non-overweight/obese children.
身高和体重是计算体重指数（BMI）的重要指标；直接测量身高和体重是获取该信息的最准确方法。然而，对于大样本人群来说，从成本和时间角度考虑，这种方法并不有效。本研究旨在调查与我们测量的韩国儿童数据相比，自我报告的身高和体重数据在预测肥胖状态方面的有效性。本研究最终纳入了 422 名五年级（平均年龄 10.5±0.5 岁）儿童，他们有自我报告和测量的身高和体重数据。超重/肥胖定义为性别特异性 BMI 年龄别第 85 百分位值或更高（体重不足：<第 5 百分位，正常：≥第 5 百分位至<第 85 百分位，超重：≥第 85 百分位至<第 95 百分位）。使用配对 t 检验检验自我报告和测量数据之间的差异。使用方差分析（ANOVA）和线性趋势检验超重/肥胖状态的差异。使用 Pearson 相关系数和 Cohen's kappa 检验自我报告和测量数据之间的一致性。尽管测量值和自我报告值之间存在显著差异，儿童倾向于自我报告身高偏高而体重偏轻，但两种方法之间的身高、体重和 BMI 相关性很高（r 值分别为 0.956、0.969、0.932，均 P<0.001），且男女均能准确报告自己的超重/非超重状态（Cohen's kappa=0.792，P<0.001）。尽管自我报告和我们的测量方法之间存在差异，但自我报告的体重和身高足以准确分类超重/肥胖状态，尤其是在非超重/肥胖儿童中。然而，由于肥胖儿童的体重低估和身高高估更大，我们需要意识到自我报告的人体测量数据在超重/肥胖儿童中不如在非超重/肥胖儿童中准确。
