3.3.4 Premature birth rate before 37 weeks
Six studies were included for this analysis [9, 11, 12, 15-17]. Due to statistical homogeneity across studies (P =0.81, I 2=0%), a fixed-effect model was utilized. Meta-analysis did not find any significant difference in the rate of premature birth before 37 weeks between the two groups (RR =0.94, 95%CI : 0.76-1.15, P =0.52) (Figure 1-5).