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Table 1 Baseline Characteristics of Study Population

From: Derivation and validation of a model predicting the likelihood of vaginal birth following labour induction

 

Characteristic

Cohort (N = 1123)*

Missing (%)

Maternal Characteristics

Maternal Age (in years)

33.9 ± 4.8

0

Height (in centimeters)

164.8 ± 7.2

3.1

Weight (pre-pregnancy) (kilograms)

67.6 ± 17.8

4.9

Body Mass Index (pre-pregnancy) (kg/m2)

24.9 ± 6.1

6.2

Weight (at-delivery) (kilograms)

82.4 ± 18.6

4.3

Body Mass Index (at-delivery) (kg/m2)

30.4 ± 6.3

5.8

Weight Gain (kilograms)

14.7 ± 6.5

7.5

Obstetrical History

Nulliparous n (%)

703 (62.6)

0

Primigravida n (%)

504 (44.9)

0

Cervical Examination

Dilation (centimeters) median and interquartile range

1.7 ± 1.32

8.4

Consistency n (%)

 

49.2

 Firm

24 (4.2)

 

 Medium

48 (8.4)

 

 Soft

498 (87.4)

 

Position n (%)

 

47.2

 Anterior

148 (25)

 

 Mid

88 (14.8)

 

 Posterior

357 (60.2)

 

Effacement n (%)

 

22.7

 0–29%

181 (20.8)

 

 30–49%

74 (8.5)

 

 50–69%

340 (39.2)

 

  > 70%

273 (31.5)

 

Fetal Station n (%)

 

46.7

 -3

233 (39.0)

 

 -2

321 (53.7)

 

 -1

36 (6.0)

 

 0

8 (1.3)

 

Labour Characteristics

Indication for Induction

 

0

 Fetal n (%)

272 (24.2)

 

 Maternal Indication for Induction n (%)

537 (47.8)

 

 Social/Geographical/Other n (%)

314 (28.0)

 

Primary Method of Induction n (%)

 

0

 Artificial rupture of membranes

334 (29.7)

 

 Cervidil

42 (3.7)

 

 Foley Catheter

139 (12.4)

 

 Oxytocin

215 (19.1)

 

 Prostaglandin Gel/Tablet

393 (35.0)

 

Gestational Age

39.4 ± 1.4

0

Mode of Delivery n (%)

 

0

 Cesarean Delivery

290 (25.8)

 

 Vaginal

833 (74.2)

 
  1. *Mean ± Standard Deviation (SD) unless otherwise noted
  2. Includes abnormal placentation, fetal anomaly, intrauterine growth restriction, abnormal non-stress test, abnormal Doppler/ Biophysical Profile findings, reduced fetal movement at term, oligohydramnios, other evidence of fetus in distress that requires early delivery
  3. Includes advanced maternal age, deterioration of maternal medical condition, gestational or pre-gestational diabetes mellitus, obstetric cholestasis, preeclampsia, pregnancy induced hypertension, post-dates, premature rupture of membranes (preterm and term), raised body mass index, therapeutic low molecular weight heparin