Table 3.

Logistic regression analysis predicting preterm birth (yes=1) based on history of previous preterm birth

Variable	B	SE	Wald	P value	Exp(B)	95% CI for Exp(B)
History of previous preterm (Yes=1)	1.70	0.82	4.34	0.04	5.48	1.11-27.22
Constant	-0.20	0.24	0.69	0.41	0.82	-

B: Regression coefficient; SE: Standard Error of the coefficient; Wald: Wald Chi square test; Exp (B): Odds Ratio; 95% CI for Exp(B): 95% Confidence Interval for the Odds Ratio; P<0.05 was considered statistically significant.