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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

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

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)
  1. Abbreviation BMI body mass index, CI confidence interval
  2. *Linear trend test