Figure 8

Preterm birth (PTB) rates (unit: %) in asymptomatic women with singleton pregnancies: (a) Intact Cervix (ICG) vs. Cervical Conization (CCG), groups; (b) Adequate cervical length (CL > 25 mm) vs Short cervix (CL ≤ 25 mm), groups; (c) Progesterone-only (POG) vs Progesterone-Pessary (PPG), groups. p-values were achieved using Mann–Whitney two-tailed t-test with Alpha = 0.05.