小児期肥満の指標としてのBMIの妥当性(西九州大学 I.健康栄養学科)

概要

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The validity of the body mass index (BMI) as an indicator of obesity was evaluated in a group of children aged 6 to 10 yr (n=327). Bioelectrical impedance analysis (BIA) using 50-kHz and tetrapolar electrodes was used for evaluating body composition. The indicator of true obesity was %Fat. For boys, obesity was defined as ≧25%Fat. For girls, the cutoff for obesity was ≧30%Fat. On the other hand, obesity was defined as a BMI and total body fat mass (TBFM) at or above the. 90th percentile and standard deviation of the average body mass for age- and sex-specific data in this study. There were correlations between BMI and TBFM or %Fat. Therefore, it appears that the BMI as determined in this study is a far more useful index with which to assess obesity, and is a reasonable indicator of fatness. However, when %Fat as determined by BIA was used as the criterion for obesity, BMI had high specificity (99.1% for boys and 98.9% for girls) and slightly lower but variable sensitivity (70.6% for boys and 94.4% for girls). Thus, almost all children who were not obese were classified correctly. In contrast, a considerable proportion of children who were obese were not correctly identified using BMI. We conclude that BMI. should be used with caution as an indicator of childhood obesity.
西九州大学の論文
2004-03-01