Table 6.

Multifactor model^a

Variable	aORa	95% CI	p-value
Breastfeeding (months)	0.954	0.935–0.973	<0.0001*
Antibiotic (courses)	1.083	1.023–1.151	0.0076*
Vitamin D drops (months × dose)	1.026	0.996–1.057	0.0928
Gender (male)	3.951	2.983–5.260	<0.0001*

Notes:

^aCovariates are age of the child, ethnicity, maternal education, Midwest, and South (n=1,244).

^*p-values <0.05.

Abbreviation: aOR, adjusted odds ratio.