Table 2.

Prevalence rates of microcephaly stratified by the living conditions in Recife, Brazil

Strata	Microcephaly Notified	Microcephaly Cases	Newborns	Prevalence per 10,000 newborns	95% CI
1	10	3	2487	12.1	2.5–35.2
2	21	8	1290	62.0	26.8–121.8
3	116	55	7984	68.9	51.9–89.6
4	200	76	11,417	66.6	52.5–83.3
TOTAL	347	142	23,178	61.3	51.6–72.2

Kruskal-Wallis test: χ² = 10.94; p = 0.012