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PTD = preterm delivery. *McDonald et al. (58) and Carey et al. (57) performed a high-risk group subanalysis; high-risk group is included in total study population of the average-risk target group. Odendaal et al. (50) included 2 target populations; high-risk and low-risk groups are 2 separate groups.
Figure 4. Absolute risk reduction of delivery before 34 weeks and before 32 weeks.
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