Table 1.
Baseline Characteristics of Study Population
| 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) |
*Mean ± Standard Deviation (SD) unless otherwise noted
†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
‡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