3.3.2 Premature birth rate before 32 weeks
Four studies were included for this
analysis[10,13,15,17]. Due to statistical
homogeneity across studies (P =0.22,I 2=31%), a fixed-effect model was applied. No
significant difference in premature birth rate before 32 weeks was found
between the two groups (RR =0.99, 95%CI : 0.59 to 1.66,P =0.96) (Figure 1-3).