Table 1 Characteristics of clusters and participants in the GBS2 trial

 Region

London and South East England

5 (50%)

5 (50%)

10 (50%)

Midlands

5 (50%)

5 (50%)

10 (50%)

 No. of vaginal deliveries or emergency Caesarean births

Median [IQR]

4539 [3567–5583]

3996 [2930–5050]

4218 [2942–5168]

 Estimated IAP rate amongst all vaginal deliveries

Median [IQR]

25.3 [22.8–32.6]

27.5 [9.9–31.7]

26.4 [13.4–32.2]

Participant

Characteristics

Rapid test (n = 722)

Usual care (n = 906)

Overall (n = 1628)

 Region

London and South East England

375 (52%)

458 (51%)

833 (51%)

Midlands

347 (48%)

448 (49%)

795 (49%)

 Age, years

Mean (SD)

29.3 (5.8)

30.1 (5.8)

29.7 (5.8)

Missing

1

0

1

 Onset of labour

Spontaneous

343 (48%)

527 (58%)

870 (53%)

Induced

354 (49%)

364 (40%)

718 (44%)

Missing

25 (3%)

15 (2%)

40 (2%)

 Type of delivery

Spontaneous vaginal

439 (61%)

542 (60%)

981 (60%)

Instrumental

102 (14%)

131 (14%)

233 (14%)

Emergency Caesarean

173 (24%)

233 (26%)

406 (25%)

Missing

8 (1%)

0 (0%)

8 (< 1%)

 Multiparity

Yes

465 (64%)

585 (65%)

1050 (65%)

No

255 (35%)

321 (35%)

576 (35%)

Missing

2 (< 1%)

0 (0%)

2 (< 1%)

 Maternal risk factor for neonatal GBS infection

One risk factor

674 (93%)

841 (93%)

1515 (93%)

Maternal temperature ≥ 38 °C

55 (8%)

139 (15%)

194 (12%)

Previous baby with GBS

35 (5%)

40 (4%)

75 (5%)

GBS in this pregnancy

293 (41%)

278 (31%)

571 (35%)

Preterm labour

291 (40%)

384 (42%)

675 (41%)

Two risk factors

46 (6%)

63 (7%)

109 (7%)

Three risk factors

2 (< 1%)

2 (< 1%)

4 (< 1%)