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Figure 3. Screening for Bacterial Vaginosis: Effectiveness of Treatment

Figure 3 shows the pooled results of four studies reporting rates of preterm delivery (PTD) before 37 weeks in high-risk patients. The pooled absolute risk reduction for Hauth, et al. (37), McDonald, et al. (38), and Morales, et al. (36) was 0.22 (90% CI=0.13 to 0.31), indicating 22 fewer preterm deliveries before 37 weeks per 100 patients treated. One study, Casey, et al. (39), was dissimilar from the others and did not pool. In that study, the ARR was -0.075 (90% CI=-0.189 to 0.039), indicating seven additional preterm deliveries before 37 weeks per 100 patients treated.

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