Table 4. Multiple hierarchical model to identify the factors associated with the exclusive use of bottles in children aged under one year. State capitals and Federal District, Brazil, 2008.

Variable	PRadjusted	95%CI	p
Model 1a
Maternal work			< 0.001e
Not working outside the home	1
On maternity leave	0.97	0.86;1.10	0.708
Working outside the home	1.39	1.32;1.47	< 0.001
Primiparity
No	1
Yes		1.06;1.17	< 0.001
Model 2b
Low birth weight
No	1
Yes	1.21	1.11;1.31	< 0.001
Model 3c
Breastfed within the first hour after birth
Yes	1
No	1.08	1.02;1.15	0.004
Model 4d
Consumed processed milk on the first day after hospital discharge
No	1
Yes	1.82	1.52;2.19	< 0.001
Consumed tea on the first day after hospital discharge
No	1
Yes	1.96	1.63;2.36	< 0.001

^a Model 1: maternal work, primiparity, infant age.

^b Model 2: Model 1 + low birth weight.

^c Model 3: Model 2 + breastfeeding within the first hour.

^d Model 4: Model 3 + intake of processed milk or tea on the first day.

^e Linear trend test.