BACKGROUND: Self-reported body mass index (BMI) has been widely used in epidemiological studies, but no study thus far has validated the self-reported BMI of Japanese children and adolescents. The aim of the present study was to assess the accuracy of self-reported BMI and its use for classification into weight categories. METHODS: Fifth- and eighth-grade students (n= 358) from all schools in Shunan City, Japan, from 2006 to 2010 were included. BMI was calculated from both self-reported and measured data. Pearson's correlation, Kappa statistics and the number of overweight children, and Bland-Altman plots with 95% limits of agreement were calculated to assess the agreement. RESULTS: Pearson's correlation between self-reported and measured data ranged between 0.946 and 0.987 for height, 0.978 and 0.992 for weight, and 0.930 and 0.964 for BMI, depending on gender or age. Kappa was excellent: 0.949 for boys, 0.867 for girls, 0.897 for 10-11-year-old children, 0.928 for 13-14-year-old adolescents. The number of overweight children based on self-reported BMI was not significantly different from that based on measured BMI. The 95% limits of agreement were -3.62 and 2.90 cm for height, -2.80 and 2.38 kg for weight, and -1.42 and 1.44 kg/m(2) for BMI. CONCLUSIONS: Self-reported BMI was generally reliable for predicting the number of overweight Japanese children and adolescents. There is slight discrepancy, however, between self-reported BMI and measured BMI, and self-reported BMI should be used with caution, keeping the variance and concordance rate in mind.
BACKGROUND: Self-reported body mass index (BMI) has been widely used in epidemiological studies, but no study thus far has validated the self-reported BMI of Japanese children and adolescents. The aim of the present study was to assess the accuracy of self-reported BMI and its use for classification into weight categories. METHODS: Fifth- and eighth-grade students (n= 358) from all schools in Shunan City, Japan, from 2006 to 2010 were included. BMI was calculated from both self-reported and measured data. Pearson's correlation, Kappa statistics and the number of overweight children, and Bland-Altman plots with 95% limits of agreement were calculated to assess the agreement. RESULTS: Pearson's correlation between self-reported and measured data ranged between 0.946 and 0.987 for height, 0.978 and 0.992 for weight, and 0.930 and 0.964 for BMI, depending on gender or age. Kappa was excellent: 0.949 for boys, 0.867 for girls, 0.897 for 10-11-year-old children, 0.928 for 13-14-year-old adolescents. The number of overweight children based on self-reported BMI was not significantly different from that based on measured BMI. The 95% limits of agreement were -3.62 and 2.90 cm for height, -2.80 and 2.38 kg for weight, and -1.42 and 1.44 kg/m(2) for BMI. CONCLUSIONS: Self-reported BMI was generally reliable for predicting the number of overweight Japanese children and adolescents. There is slight discrepancy, however, between self-reported BMI and measured BMI, and self-reported BMI should be used with caution, keeping the variance and concordance rate in mind.
Authors: Leah M Lipsky; Denise L Haynie; Christine Hill; Tonja R Nansel; Kaigang Li; Danping Liu; Ronald J Iannotti; Bruce Simons-Morton Journal: Am J Prev Med Date: 2019-04-17 Impact factor: 5.043
Authors: C C Kee; K H Lim; M G Sumarni; C H Teh; Y Y Chan; M I Nuur Hafizah; Y K Cheah; E O Tee; Y Ahmad Faudzi; M Amal Nasir Journal: BMC Med Res Methodol Date: 2017-06-02 Impact factor: 4.615