Table 1. Average infant mortality rate per thousand live births. Aracaju, SE, Northeastern Brazil, 2001 to 2005 and 2006 to 2010.

Living Condition Index	Average infant mortality rate		p*
	2001-2005	2006-2010
High	20.7	13.7	0.020
Intermediate	23.1	18.4	0.100
Low	25.4	18.0	0.009
Very low	30	19.6	< 0.001
Aracaju, SE	25.3	17.7	0.002

* Student t test