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

BMC Public Health

Table 4 Body composition 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^c
	≤11	12–13	≥14
	β (95 % CI)^a
Waist circumference (cm)	5.27	1.76	Reference	<0.0001*
Waist circumference (cm)	(3.43; 7.10)	(0.18; 3.33)	Reference	<0.0001*
Abdominal visceral fat layer thickness (cm)	0.51	0.17	Reference	<0.001*
Abdominal visceral fat layer thickness (cm)	(0.23; 0.79)	(−0.07; 0.41)	Reference	<0.001*
Fat mass index (kg/m²)	2.33	0.56	Reference	<0.0001*
Fat mass index (kg/m²)	(1.64; 3.02)	(−0.02; 1.15)	Reference	<0.0001*
Fat-free mass index (kg/m²)	4.11	1.09	Reference	<0.0001*
Fat-free mass index (kg/m²)	(2.74; 5.48)	(−0.08; 2.26)	Reference	<0.0001*
BMI (kg/m²)	2.98	0.81	Reference	<0.0001*
BMI (kg/m²)	(2.07; 3.88)	(0.03; 1.59)	Reference	<0.0001*
Overweight^a,b	1.5	1.15	Reference	<0.0001**
Overweight^a,b	(1.28; 1.75)	(0.98; 1.34)	Reference	<0.0001**

^aAdjusted for: maternal pregestational weight, maternal schooling, household score index, family income, birth weight, skin color, and weight for height z-score at 4 years; ^bPrevalence Ratio (95 % CI); ^cLinear trend test *Multi-variable regress **Poisson

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