Table 2.

Adjusted linear regression models for lung function at age 10 years and breastfeeding duration

	Model 1*								Model 2†
Breastfeeding duration	FVC (ml)		FEV1 (ml)		FEV1/FVC (%)		PEF (ml/sec)		FEV1 (ml)		PEF (ml/s)
	β‡ (SE)	p Value	β‡ (SE)	p Value	β‡ (SE)	p Value	β‡ (SE)	p Value	β‡ (SE)	p Value	β‡ (SE)	p Value
Not breastfed	Ref		Ref		Ref		Ref		Ref		Ref
>2 months	9.6 (22.4)	0.67	14.3 (21.3)	0.50	0.28 (0.57)	0.62	114.7 (70.2)	0.10	7.16 (12.8)	0.57	105.9 (67.2)	0.12
2 to <4 months	6.9 (25.7)	0.79	16.8 (24.5)	0.49	0.57 (0.65)	0.38	143.4 (80.6)	0.08	11.5 (14.7)	0.43	137.1 (77.2)	0.08
≥4 months	54.0 (21.1)	0.01	39.5 (20.1)	0.05	−0.40 (0.53)	0.45	180.8 (66.1)	0.006	−1.6 (12.1)	0.90	131.7 (63.5)	0.04

Number of children included in the analysis for the FVC model was 929.

^*Model 1 was adjusted for height, weight and birth weight (as continuous variables) and for gender, family social status cluster, maternal education (as categorical variables).

^†For model 2, in addition to all the variables in model 1, we also adjusted for FVC.

^‡Model coefficient (SE).

FEV₁, forced expiratory volume in 1 s; FVC, forced vital capacity; PEF peak expiratory flow; Ref, reference group.