Preterm birth clinic interventions and pregnancy outcomes*
Characteristics | Proportion (%) 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 only | 16/72 (22.2) |
Vaginal progesterone only | 4/72 (5.6) |
Both cervical cerclage and vaginal progesterone | 10/72 (13.9) |
No treatment | 40/72 (55.6) |
Antenatal hospital admission from clinic due to preterm birth risk | 2/72 (2.8) |
Risk of preterm birth for those who had an exit visit† | |
Low | 45/66 (68.2) |
Intermediate | 18/66 (27.3) |
High | 3/66 (4.5) |
Pregnancy outcome | |
Termination of pregnancy for fetal anomalies | 2/72 (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 birth | 44/68 (64.7) |
Instrumental birth | 7/68 (10.3) |
Caesarean section | 17/68 (25.0) |
Neonatal outcome for pregnancies that reached ≥20+0 weeks§¶ | |
Alive at hospital discharge | 67/69 (97.1) |
Early neonatal death | 1/69 (1.4) |
Stillbirth | 1/69 (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.