Table 4

Preterm birth clinic interventions and pregnancy outcomes*

CharacteristicsProportion (%) or mean (SD)
Shortest transvaginal cervical length measurement
 Mean (SD) (in mm)27.0 (9.1)
 Range (in mm)0–39
 No <25 mm (threshold for intervention)21/72 (29.2)
Treatments given to reduce the risk of preterm birth
 Cervical cerclage only16/72 (22.2)
 Vaginal progesterone only4/72 (5.6)
 Both cervical cerclage and vaginal progesterone10/72 (13.9)
 No treatment40/72 (55.6)
Antenatal hospital admission from clinic due to preterm birth risk2/72 (2.8)
Risk of preterm birth for those who had an exit visit†
 Low45/66 (68.2)
 Intermediate18/66 (27.3)
 High3/66 (4.5)
Pregnancy outcome
 Termination of pregnancy for fetal anomalies2/72 (2.8)
 First trimester miscarriage (<13+0 weeks)1/72 (1.4)
 Second trimester loss (13+1 to 22+6 weeks)2/72 (2.8)
 Extremely early preterm birth (23+0 to 27+6 weeks)‡3/72 (4.2)
 Very early preterm birth (28+0 to 31+6 weeks)1/72 (1.4)
 Moderate to late preterm birth (32+0 to 36+6 weeks)11/72 (15.3)
 Term birth (≥37+0 weeks)52/72 (72.2)
Mode of birth for pregnancies that reached ≥20+0 weeks§
 Normal vaginal birth44/68 (64.7)
 Instrumental birth7/68 (10.3)
 Caesarean section17/68 (25.0)
Neonatal outcome for pregnancies that reached ≥20+0 weeks§¶
 Alive at hospital discharge67/69 (97.1)
 Early neonatal death1/69 (1.4)
 Stillbirth1/69 (1.4)
  • *Excluding one with all follow-up at local hospital after first visit as no further data collected.

  • †Risk assessment defined in online supplemental table 4. Quantitative fetal fibronectin was included in 29/66 (44%) cases. Excludes six women who did not have an exit appointment. Includes three women who did not complete Set 3 questionnaires—for two the exit visit was their second visit, both were high risk and delivered prior to planned completion of the set 3 questionnaires by post; and one who declined.

  • ‡Includes one prelabour fetal demise.

  • §Excluding one termination of pregnancy >20 weeks.

  • ¶Includes one set of twins.