Table 4.

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.