Table 2.  Differences in the frequency of PE classes per week relative to the BMI standard.

Group Normal Underweight Overweight Obesity Overall, F Overall, P* Boys, Mean (±SD) 2.05 (.87) 2.35 (.78) ††† 2.04 (.86) 2.01 (.88) † 310.311 < .001 Girls, Mean (±SD) 1.95 (.94) 2.21 (.89) ††† 1.88 (.95) †† 1.82 (.97) ††† 226.770 < .001 Total population 2.00 (.91) 2.28 (.84) ††† 1.97 (.90) 1.96 (.91) †† 497.730 < .001 N (%) Normal Underweight Overweight Obesity Total population Boys 19,685 (51.6) 09,719 (25.5) 04,382 (11.5) 04,366 (11.4) 38,152 (100.0) Girls 19,655 (57.4) 10,012 (29.2) 02,967 (08.7) 01,613 (04.7) 34,247 (100.0) Total population 39,340 (54.2) 19,731 (27.3) 07,349 (10.2) 05,979 (08.3) 72,399 (100.0) BMI, Body Mass Index. * by one-way ANOVA. †, †† and ††† denote p < 0.05, p < 0.01 and p < 0.001, respectively, compared to normal group by Scheffe test.