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Table 2 Mean and confidence interval of the body composition variables at 30 years in the 1982 Pelotas birth cohort according to categories of age at menarche

From: Impact of the age at menarche on body composition in adulthood: results from two birth cohort studies

Variables at 30 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) 405 84.8 874 79.9 358 78.4 <0.0001*
(83.5; 86.0) (79.1; 80.6) (77.2; 79.6)
Abdominal visceral fat layer thickness (cm) 395 5.29 859 4.87 354 4.74 <0.0001*
(5.10; 5.48) (4.76; 4.98) (4.59; 4.89)
Fat mass index (kg/m2) 385 12.5 855 10.3 349 9.7 <0.0001*
(12.1; 13.0) (10.1; 10.6) (9.3; 10.2)
Fat-free mass index (kg/m2) 385 16.4 855 15.1 349 15.6 <0.0001*
(16.2; 16.6) (15.6; 15.8) (15.4; 15.8)
BMI (kg/m2) 402 29.1 870 26.2 361 25.5 <0.0001*
(28.5; 29.7) (25.8; 26.6) (24.9; 26.1)
Overweight (%) 279 69.4 430 49.4 158 43.8 <0.001*
(64.9; 73.9) (46.1; 52.3) (38.6; 48.9)
  1. Abbreviation: BMI body mass index, CI confidence interval
  2. *Linear trend test