Table 1

Women’s characteristics of training and validation cohorts

CharacteristicsTraining cohort (N=1491)Validation cohort (N=373)P value
Research centreHospital in Shenzhen898 (60.2)220 (59.0)
Hospital in Dongguan593 (39.8)153 (41.0)0.66
Age (years)<351311 (87.9)340 (91.1)
≥35180 (12.1)33 (8.9)0.08
Education (years)<9847 (56.8)219 (58.7)
≥9644 (43.2)154 (41.3)0.51
Gestational age (weeks)≥41209 (14.0)55 (14.8)
<411282 (86.0)318 (85.2)0.72
ParityOne previous delivery1264 (84.8)333 (89.3)
≥2 previous deliveries227 (15.2)40 (10.7)0.03
Number of abortions<31405 (94.2)353 (94.6)
≥386 (5.8)20 (5.4)0.76
History of vaginal deliveryNo1266 (84.9)334 (89.5)
Yes225 (15.1)39 (10.5)0.02
Success of TOLACNo142 (9.5)36 (9.7)
Yes1349 (90.5)337 (90.3)0.94
Time from previous delivery (years)≤261 (4.1)10 (2.7)
>21430 (95.9)363 (97.3)0.20
BMI (kg/m2)≥30150 (10.1)32 (8.6)
<301341 (89.9)341 (91.4)0.39
Diabetes or pregestational diabetesYes126 (8.5)30 (8.0)
No1365 (91.5)343 (92.0)0.80
HypertensionYes23 (1.5)7 (1.9)
No1468 (98.5)366 (98.1)0.65
Estimated birth weight (kg)≥446 (3.1)14 (3.7)
<41445 (96.9)359 (96.3)0.51
Previous caesarean indicationsRecurrent3 (0.2)1 (0.3)
Non-recurrent1488 (99.8)372 (99.7)0.80
Onset of labourInduced291 (19.5)66 (17.7)
Spontaneous1200 (80.5)307 (82.3)0.42
Oxytocin augmentationYes294 (19.7)69 (18.5)
No1197 (80.3)304 (81.5)0.59
AnalgesicYes4 (0.3)0 (0.0)
No1487 (99.7)373 (100.0)0.32
Cervix Bishop score<5660 (44.3)165 (44.2)
≥5831 (55.7)208 (55.8)0.99
Ruptured of membranesYes297 (19.9)72 (19.3)
No1194 (80.1)301 (80.7)0.79
  • BMI, body mass index; TOLAC, trial of labour after caesarean delivery.