Table 2.

Odds ratio of overweight^a and obesity^b among children by duration of breastfeeding in infancy (n = 2066)

	Overweight			Obesity
	OR	(95% CI)	P for trend	OR	(95% CI)	P for trend
1. Breastfeeding duration
0 months	1.00			1.00
< 2 months	0.89	(0.59, 1.34)		0.84	(0.45, 1.56)
2-< 4 months	0.66	(0.42, 1.03)		0.44	(0.20, 0.94)
4-< 6 months	0.69	(0.46, 1.04)		0.53	(0.28, 1.02)
≥6 months	0.54	(0.38, 0.77)	< 0.001	0.40	(0.24, 0.69)	< 0.001
2. Model 1 + age and sex of child
0 months	1.00			1.00
< 2 months	0.91	(0.60, 1.36)		0.85	(0.46, 1.58)
2-< 4 months	0.67	(0.43, 1.04)		0.44	(0.20, 0.95)
4-< 6 months	0.70	(0.47, 1.05)		0.54	(0.28, 1.03)
≥ 6 months	0.55	(0.39, 0.77)	< 0.001	0.40	(0.24, 0.70)	< 0.001
3. Model 2 + mother's age at birth, years of secondary education and country of birth
0 months	1.00			1.00
< 2 months	0.94	(0.63, 1.43)		0.90	(0.48, 1.69)
2-< 4 months	0.71	(0.46, 1.12)		0.47	(0.22, 1.03)
4-< 6 months	0.77	(0.51, 1.13)		0.62	(0.32, 1.20)
≥6months	0.63	(0.44, 0.99)	0.001	0.49	(0.28,0.87)	0.005
4. Model 3 + child's mean daily energy intake, physical activity, screen time and sleep duration
0 months	1.00			1.00
< 2 months	0.94	(0.62, 1.43)		0.88	(0.47, 1.68)
2-< 4 months	0.70	(0.44, 1.10)		0.47	(0.22, 1.04)
4- < 6 months	0.78	(0.52, 1.19)		0.61	(0.31, 1.20)
≥ 6 months	0.64	(0.44, 0.91)	0.002	0.51	(0.29, 0.90)	0.009

^a Age and gender specific BMI equivalent to an adult BMI of ≥25 kg/m²

^b Age and gender specific BMI equivalent to an adult BMI of ≥30 kg/m² [18]