Table 3. Body composition and body fat distribution in young adulthood according to breastfeeding duration in infancy, DONALD Study (n = 125 women, 108 men)^a.

	Duration of full breastfeeding
Outcome	Never (≤2 weeks)	Short (3–17 weeks)	Long (>17 weeks)	ptrend
Women
Fat mass index (kg/m2)
Model 1b	7.9 (7.2; 8.8)	6.8 (6.2; 7.4)	6.1 (5.5; 6.8)	0.001
Model 2c	7.9 (7.1; 8.7)	6.8 (6.2; 7.5)	6.4 (5.7; 7.2)	0.01
Fat-free mass index (kg/m2)
Model 1	16.2 (15.7; 16.7)	15.2 (14.8; 15.6)	15.1 (14.6; 15.6)	0.003
Model 2	16.1 (15.6; 16.6)	15.1 (14.6; 15.6)	15.2 (14.6; 15.8)	0.02
Waist circumference (cm)
Model 1	76.2 (73.8; 78.7)	72.6 (70.5; 74.7)	70.2 (67.9; 72.5)	0.001
Model 2	75.8 (73.2; 78.5)	72.4 (70.2; 74.7)	70.5 (67.9; 73.2)	0.004
Men
Fat mass index (kg/m2)
Model 1	4.5 (3.9; 5.3)	3.9 (3.4; 4.5)	4.3 (3.6; 5.2)	0.6
Model 2	4.5 (3.8; 5.2)	3.8 (3.3; 4.4)	4.3 (3.6; 5.2)	0.6
Fat-free mass index (kg/m2)
Model 1	19.3 (18.7; 19.9)	18.8 (18.3; 19.4)	19.6 (18.9; 20.3)	0.7
Model 2	19.3 (18.7; 19.9)	18.9 (18.3; 19.5)	19.6 (18.9; 20.4)	0.7
Waist circumference (cm)
Model 1	84.4 (81.7; 87.1)	79.8 (77.5; 82.1)	83.3 (80.2; 86.6)	0.5
Model 2	84.2 (81.4; 86.9)	79.5 (77.0; 82.0)	83.3 (80.1; 86.6)	0.5

^aData are adjusted means (95% CI). Abbreviations used: DONALD, Dortmund Nutritional and Anthropometric Longitudinally Designed. Missing values: n = 1 for firstborn status.

^bModel 1: adjusted for age in adulthood.

^cModel 2 for FMI, WC: adjusted for age in adulthood, maternal overweight (yes/no), paternal university degree (yes/no), firstborn status (yes/no), smoking in the household (yes/no). Model 2 for FFMI: adjusted for age in adulthood, maternal overweight (yes/no), paternal university degree (yes/no), birth weight and length (appropriate for gestational age yes/no), firstborn status (yes/no), smoking in the household (yes/no).