Table 2.

Factors associated with severe microcephaly*.

	HC = 0 PERCENTILE N = 33	HC > 0 PERCENTILE N = 47	CRUDE PRR (95% CI)
Sex
Male	20 (46.5%)	23 (53.5%)	1.32 (0.77–2.28)
Female	13 (35.1%)	24 (64.9%)	ref
Region of residence
Greater Santo Domingo¶	14 (35.9%)	25 (64.1%)	0.77 (0.45–1.32)
All other provinces	19 (46.3%)	22 (53.7%)	ref
Insurance
Any	7 (31.8%)	15 (68.2%)	0.71 (0.36–1.41)
None	22 (44.9%)	27 (55.1%)	ref
Women confirmed ZIKV+
Yes	16 (43.2%)	21 (56.8%)	1.09 (0.65–1.84)
No/unknown	17 (39.5%)	26 (60.5%)	ref
Preterm birth
Yes (32–36 weeks)	4 (40.0%)	6 (60.0%)	0.96 (0.43–2.17)
No (≥37 weeks)	29 (41.4%)	41 (58.6%)	Ref

* Five cases were excluded because head circumference measurement could not be determined/confirmed.

^¶ Includes residents of Monte Plata Province.

PRR = Prevalence Rate Ratio;

CI = Confidence Interval;

Ref = reference category.