Skip to main content

Table 2 Gender differences in body composition and weight status categories, by birth cohort

From: Association between parental socioeconomic status with underweight and obesity in children from two Spanish birth cohorts: a changing relationship

  Birth cohort
1999-2000 (n = 1158) 2007-2008 (n = 1588)
Boys Girls   Boys Girls  
n = 587 n = 571 p n = 806 n = 782 p
Body composition variables, mean (SD)
BMI (kg/m2) 19.2 (3.8) 18.8 (3.5) 0.1 16.0 (2.5) 15.8 (2.5) 0.2
BF% 23.9 (7.1) 26.8 (6.1) <0.001 20.0 (5.2) 20.4 (6.4) 0.2
BMI-for-age z-score 0.9 (1.4) 0.7 (1.3) 0.002 0.2 (1.4) 0.1 (1.4) 0.1
Weight status categories, % (95 % CI)
Underweight 8.5 (6.2-10.9) 7.7 (5.4-10.0) 0.69 19.9 (17.0-22.7) 21.2 (18.3-24.1) 0.54
Normal weight 53.8 (49.7-57.9) 59.0 (54.9-63.1) 0.08 61.4 (58.0-64.8) 56.5 (52.9-60.1) 0.05
Overweight 27.1 (23.4-30.8) 23.8 (20.2-27.4) 0.23 10.3 (8.1-12.4) 13.4 (11.0-15.9) 0.06
Obesity 10.6 (7.9-13.1) 9.5 (7.0-11.9) 0.60 8.4 (6.4-10.4) 8.8 (6.8-10.9) 0.85
Overweight/ obesity 37.7 (33.6-41.6) 33.3 (29.3-37.2) 0.13 18.7 (16.0-21.3) 22.2 (19.3-25.2) 0.09
  1. Abbreviations: BMI body mass index, BF% body fat percentage, CI confidence interval, SD Standard deviation; in bold when p < 0.05