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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