Table 5.
Regression of the body composition variables at 18 years in the 1993 Pelotas birth cohort according to categories of age at menarche
| Variables at 18 years | Confounding factor adjustmenta | Confounding factor adjustmenta + BMIc at 11 years | Confounding factor adjustmenta | Confounding factor adjustmenta + BMIc at 11 years | Reference |
|---|---|---|---|---|---|
| β (95 % CI) | |||||
| Age at Menarche (years) | |||||
| ≤11 | 12–13 | ≥14 | |||
| Waist circumference (cm) | 5.1 | 0.13 | 2.74 | 0.34 | - |
| (3.4; 6.3) | (−0.85; 1.1) | (1.7; 3.8) | (−0.51; 1.2) | ||
| Fat mass index (kg/m2) | 2.2 | 0.26 | 1.2 | 0.26 | - |
| (1.7; 2.6) | (−0.08; 0.60) | (0.78; 1.6) | (−0.04; 0.55) | ||
| Fat-free mass index (kg/m2) | 0.39 | −0.24 | 0.24 | −0.07 | - |
| (0.20; 0.58) | (−0.41; −0.07) | (0.07; 0.41) | (−0.22; 0.08) | ||
| BMI (kg/m2) | 2.8 | 0.13 | 1.5 | 0.20 | - |
| (2.2; 3.4) | (−0.31; 0.56) | (0.97; 2.0) | (−0.18; 0.58) | ||
| Overweighta,b | 2.2 | 1.2 | 1.7 | 1.2 | - |
| (1.7; 2.7) | (0.93; 1.4) | (1.3; 2.1) | (0.97–1.4) | ||
aAdjustment for confounding factors: maternal pregestational weight, maternal schooling, household score index (18 years of age), family income at birth, birth weight, and skin color (11 years of age); bPrevalence Ratio (95 % CI); cBMI z-score at 11 years