Statistical analysis will be performed using the SPSS statistical package. Categoric data like maternal characteristics, the rates of neonatal morbidity and mortality will be compared using Chi square when sample sizes support the approximation. Otherwise, categorical data will be analyzed with two-tailed Fisher exact test if the expected cell frequencies were small. Continuous variables will be compared by Student t test if assumptions of normality and homogeneity of variances appeared to be reasonable. Unpaired variables and differences in distributions will be compared using the Mann-Whitney test. Neonatal outcomes will be analyzed comparing the total number of affected neonates in each group. A p-value <0.05 will be considered statistically significant.