Table 4.

Correlations of body mass index (BMI) and percent body fat (%BF) or waist circumference (WC) by obesity or non-obesity according to the definition of obesity in Japanese children

	Boys				Girls
	Fourth graders		Seventh graders		Fourth graders		Seventh graders
	Non-obesity (n = 975)	Obesity (n = 97)	Non-obesity (n = 827)	Obesity (n = 51)	Non-obesity (n = 961)	Obesity (n = 29)	Non-obesity (n = 810)	Obesity (n = 18)
%BF vs. BMI	0.57	0.53	0.52	0.17	0.96	0.70	0.95	0.83
WC vs. BMI	0.89	0.90	0.89	0.89	0.87	0.76	0.85	0.78

Fourth graders are aged 9 or 10 years

Seventh graders are aged 12 or 13 years

Values are Pearson's correlation coefficients

All values are statistically significant except the value of the obese seventh-grade boys