Table 3. The adjusted odds ratio of relevant risk factors remained significant in the stepwise logistic regression model.

Risk factors	OR (95% CI)	p value╡
Gestational age		0.001╞
20-33 wks.	94.01 (31.5-280.3)	0.001
34-37 wks.	1 (-)	-
≥38 wks.	0.22 (0.11-0.44)	0.001
Preeclampsia
Yes vs. No	3.41 (1.25-9.29)	0.01

╞ p-values were derived from the likelihood ratio test.

╡p-values for comparison of each exposure level with reference category were derived from the Wald’s test.