Table 4.

Associations between variables of interest and any mixed feeding from birth to 60 days of age, unadjusted and adjusted odds ratios.

Characteristic	Unadjusted odds ratios		Adjusted odds ratios
	OR (95% CI)	p	OR (95% CI)	p
Maternal age (5-year change)	1.1 (0.9 to 1.3)	0.420	1.4 (1.0 to 1.9)	0.029
Maternal educational attainment
Incomplete primary school (<6 years)	Ref		Ref
Incomplete secondary school (6-11 years)	0.6 (0.2 to 1.7)	0.309	0.2 (0.1 to 0.9)	0.034
Complete secondary school (12 years)	0.8 (0.3 to 2.0)	0.575	0.4 (0.1 to 1.3)	0.132
Civil status
Stable partner	Ref		Ref
Single mother	2.9 (1.3 to 6.4)	0.010	1.5 (0.6 to 4.1)	0.389
Parity
Multiparous	Ref		Ref
Primiparous	1.4 (0.8 to 2.6)	0.275	2.2 (0.9 to 5.4)	0.070
Maternal employment outside of home when infant < 6 months of age
No	Ref		Ref
Yes	3.9 (2.0 to 7.4)	<0.001	3.2 (1.5 to 6.8)	0.002
Infant birthweight in grams	0.98 (0.6 to 1.6)	0.932	1.3 (0.7 to 2.5)	0.438
Household wealth	1.0 (0.8 to 1.3)	0.938	0.8 (0.6 to 1.2)	0.278
Mode of delivery
Vaginal	Ref		Ref
Cesarean	1.7 (0.9 to 3.1)	0.085	1.5 (0.7 to 3.1)	0.274
Site of birth
Public hospital	Ref
Public health center	0.5 (0.2 to 0.9)	0.023
EsSalud hospital	0.7 (0.4 to 1.5)	0.409
Private clinic	1.0 (0.3 to 3.7)	0.973
Health provider recommended formula
No	Ref		Ref
Yes	8.8 (4.5 to 17.2)	<0.001	10.2 (4.8 to 21.6)	<0.001
Health provider prescribed formulaa
No	Ref
Yes	7.3 (3.4 to 15.7)	<0.001
Member of social network recommended formula
No	Ref		Ref
Yes	1.4 (0.8 to 2.4)	0.252	1.5 (0.8 to 3.0)	0.235

^aThis variable was not included in the multivariable analysis due to its close correlation with formula being recommended by a health provider.