Table 2.

Crude mean PSAI scores and regression estimates (β) for exposure groups and select categorical and continuous covariates.

Covariate	Boys	Girls
Infant feeding method [mean PSAI score (95% CI)]
Early formulaa		62.6 (62.2, 62.9)		36.7 (36.4, 37.1)
Early soy		63.0 (61.3, 64.7)		40.8 (38.6, 43.0)
Late soy		62.1 (60.9, 63.3)		37.0 (35.4, 38.6)
Primarily breast-fed		61.3 (60.6, 61.9)		37.1 (36.4, 37.8)
Presence of older brother [mean PSAI score (95% CI)]
Noa		61.6 (61.2, 61.9)		35.9 (35.5, 36.3)
Yes (≥ 1)		63.7 (63.2, 64.2)		39.2 (38.7, 39.8)
Missing		62.8 (61.4, 64.1)		36.2 (34.6, 37.7)
Presence of older sister [mean PSAI score (95% CI)]
Noa		63.2 (62.9, 63.6)		37.5 (37.2, 37.9)
Yes (≥ 1)		60.2 (59.7, 60.8)		35.5 (34.9, 36.1)
Missing		62.7 (61.3, 64.0)		36.2 (34.7, 37.7)
Regular child care attendance [mean PSAI score (95% CI)]
Noa		62.2 (61.9, 62.6)		36.7 (36.3, 37.1)
Yes		62.4 (61.9, 62.9)		37.2 (36.7, 37.8)
Missing		62.7 (61.4, 64.0)		37.1 (35.7, 38.4)
Prenatal smoking [mean PSAI score (95% CI)]
Noa		62.0 (61.7, 62.3)		36.7 (36.3, 37.0)
Yes		63.7 (63.0, 64.4)		38.2 (37.4, 39.1)
Missing		62.0 (60.5, 63.6)		36.2 (34.5, 37.9)
Maternal education [mean PSAI score (95% CI)]
University degreea		60.5 (59.8, 61.3)		38.6 (37.8, 39.4)
Advanced level		62.0 (61.4, 62.6)		37.4 (36.7, 38.0)
Ordinary level		62.7 (62.2, 63.1)		36.2 (35.6, 36.7)
Vocational		62.4 (61.6, 63.3)		35.9 (34.9, 36.9)
CSE/none		63.2 (62.4, 64.1)		36.9 (36.0, 37.9)
Missing		63.2 (62.1, 64.4)		36.6 (35.3, 37.8)
Age at PSAI assessment [β (95% CI)]		0.24 (–0.12, 0.60)		–0.46 (–0.85, –0.08)
Maternal age at delivery [β (95% CI)]		–0.02 (–0.08, 0.04)		0.17 (0.11, 0.24)
Maternal interaction score [β (95% CI)]		0.02 (–0.04, 0.08)		0.01 (–0.05, 0.08)
Partner interaction score [β (95% CI )]		0.00 (–0.03, 0.04)		0.02 (–0.02, 0.06)
aReferent category.