Table 3 Mean and confidence interval 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 | Age at Menarche (years) | P-value | |||||
|---|---|---|---|---|---|---|---|
≤11 | 12–13 | ≥14 | |||||
N | Mean | N | Mean | N | Mean | ||
(95 % CI) | (95 % CI) | (95 % CI) | |||||
Waist circumference (cm) | 550 | 76.0 | 1037 | 73.7 | 408 | 70.9 | <0.0001* |
(75.1; 76.9) | (73.2; 74.3) | (70.1; 71.7) | |||||
Fat mass index (kg/m2) | 530 | 9.40 | 1008 | 8.43 | 402 | 7.19 | <0.0001* |
(9.08; 9.72) | (8.22; 8.65) | (6.89; 7.49) | |||||
Fat-free mass index (kg/m2) | 530 | 15.12 | 1008 | 15.00 | 402 | 14.75 | 0.0009* |
(15.00; 15.25) | (14.90; 15.09) | (14.62; 14.88) | |||||
BMI (kg/m2) | 550 | 24.8 | 1036 | 23.5 | 408 | 21.9 | 0.0001* |
(24.4; 25.2) | (23.2; 23.8) | (21.6; 22.3) | |||||
Overweight (%) | 203 | 36.9 | 303 | 29.3 | 72 | 17.7 | <0.001* |
(32.9; 41.0) | (26.5; 32.0) | (13.9; 21.4) | |||||