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Table 2 Correlations of body mass index (BMI) and percent body fat (%BF) or waist circumference (WC) for each gender by grade

From: Relationship of body mass index to percent body fat and waist circumference among schoolchildren in Japan - the influence of gender and obesity: a population-based cross-sectional study

 

Fourth graders

Seventh graders

 

Boys

(n = 1,054)

Girls

(n = 990)

Boys

(n = 878)

Girls

(n = 828)

%BF vs. BMI

0.74

0.97

0.69

0.96

WC vs. BMI

0.94

0.90

0.94

0.88

  1. Fourth graders are aged 9 or 10 years
  2. Seventh graders are aged 12 or 13 years
  3. Values are Pearson's correlation coefficients
  4. All values were statistically significant