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Table 1 Characteristics of the boys and girls studied

From: Median ages at stages of sexual maturity and excess weight in school children

Study variables Boys (47.7%) Girls (52.3%) p§
  Median (p25 ; p75)*  
Age (years) 11 (10;13) 12 (10;13) 0.53
BMI Z score 0.51 (-0.22;1.42) 0.21 (-0.41;0.96) <0.001
Stature Z score 0.25 (-0.41;0.99) 0.11 (-0.52;0.79) 0.002
  %  
Excess weight 34.4 24.0 <0.001
Sexual Maturity Classification    0.94
Precocious 33.1 32.5  
Late 32.2 32.7  
Mother’s excess weight 31.0 33.4 0.31
Weight at birth (grams)    <0.001
< 2,500 5.8 8.3  
≥ 4,000 14.4 8.1  
Active commute to school 43.6 45.0 0.56
Type of school    0.97
Public 65.4 65.5  
Private 34.6 34.5  
  1. * p25 and p75; percentiles 25 and 75, respectively.
  2. § Mann–Whitney test (quantitative variables) and Rao-Scott test (qualitative variables).
  3. Brazil, 2007.