Table 2.

Association between breastfeeding at four months of age and neighbourhood household purchasing power, without and with adjustments for individual-level variables

Explanatory variable	Neighbourhood-level without adjustments	Neighbourhood-level with adjustments
Category	OR (95% CI)	OR (95% CI)
Neighbourhood purchasing power*
< 10	1.00 (reference)	1.00 (reference)
10–19.9	1.21 (0.87-1.70)	1.05 (0.74-1.48)
20–29.9	1.51 (1.11-2.05)	1.09 (0.79-1.52)
30+	2.14 (1.45-3.16)	1.63 (1.07-2.46)
p-value for trend†	0.00004	0.052
Maternal age (yrs)	- ‡
≤ 20		2.49 (1.24-4.99)
21+		1.00 (reference)
Maternal smoking	- ‡
No		1.00 (reference)
Yes		2.57 (1.74-3.80)
Maternal and paternal education	- ‡
Both post-secondary		1.00 (reference)
One post-secondary		1.44 (1.09-1.92)
None post-secondary		2.07 (1.58-2.73)

^*Proportion (%) of families with low neighbourhood household purchasing power (according to Swedish standards; < USD 19 500 neighbourhood household purchasing power) among all resident families with at least one child (up to 19 years old) in a neighbourhood area (parish). Neighbourhood household purchasing power was defined as total family disposable income adjusted for the composition of the family (number of adults and children).

^†Cochran-Armitage trend test (two-sided p-value).

^‡Not included.