Table 3.

Correlations of body mass index (BMI) and percent body fat (%BF) or waist circumference (WC) by obesity or non-obesity according to the obese definition of Centers for Disease Control and Prevention

	Boys				Girls
	Fourth graders		Seventh graders		Fourth graders		Seventh graders
	Non-obesity (n = 967)	Obesity (n = 87)	Non-obesity (n = 825)	Obesity (n = 53)	Non-obesity (n = 959)	Obesity (n = 31)	Non-obesity (n = 810)	Obesity (n = 18)
%BF vs. BMI	0.60	0.45	0.54	0.20	0.96	0.71	0.96	0.78
WC vs. BMI	0.87	0.86	0.87	0.85	0.86	0.72	0.85	0.79

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 obese seventh-grade boys