Figure 4

Ultrasound cervical length (USCL) assessed in non-pregnant women before (1) and after (2) cervical conization, and during pregnancy (3), unit: mm, box & whiskers, 1–99 percentiles) 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.