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

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)

Abbreviation: BMI body mass index, CI confidence interval

*Linear trend test