Table 3. Effect of Covariate Adjustment on Estimated Associations of Breastfeeding Duration^* with Child Cognition.

	Age 3 years (n=1224)	Age 7 years (n=1037)
	Points per month breastfed and 95% confidence interval
	PPVT-III	KBIT-II verbal	KBIT-II non-verbal
Model 0: Child age & sex	0.58 (0.40, 0.76)	0.96 (0.77, 1.14)	0.65 (0.43, 0.87)
Model 1: Model 0 + fetal growth, gestational age	0.57 (0.39, 0.75)	0.95 (0.76, 1.14)	0.64 (0.42, 0.86)
Model 2: Model 1 + demographic variables†	0.29 (0.12, 0.47)	0.46 (0.28, 0.65)	0.38 (0.13, 0.62)
Model 3: Model 2 + HOME score	0.29 (0.11, 0.46)	0.46 (0.27, 0.64)	0.38 (0.13, 0.62)
Model 4: Model 3 + maternal IQ	0.21 (0.03, 0.38)	0.35 (0.16, 0.53)	0.29 (0.05, 0.54)

^*any breastfeeding through 12 months of age

^†child race/ethnicity, maternal age, parity, smoking status, parental education level and marital status, annual household income, maternal depression at 6 months post-partum, maternal employment and child care at age 6 months, and primary language