Fig. 4From: Finding the priority and cluster of inflammatory biomarkers for infectious preterm birth: a systematic reviewThe forest plot of comparison of maternal CRP/IL-1β/IL-6 cluster between normal and PTB patients in gestational 27–34 weeks. SMD: 3.633; 95% CI: 1.971 to 5.296; P < 0.05, and I2 = 93.5%. (SMD indicated standard mean difference; CI indicated confidence interval)Back to article page