Table 1.
Characteristics of women from the derivation group by mode of delivery
| Characteristic | Vaginal Delivery n (%) | Cesarean Delivery n (%) | P valuea |
|---|---|---|---|
| Maternal Age, yearsb | 28 (22–32) | 25 (22–32) | 0.26 |
| Height, inches | |||
| <62″ | 44 (12.4) | 23 (16.9) | 0.05 |
| 62–63.9″ | 68 (19.2) | 38 (27.9) | |
| 64–65.9″ | 108 (30.5) | 31 (22.8) | |
| ≥66″ | 134 (37.8) | 44 (32.3) | |
| BMI at delivery, kg/m2 | |||
| <25.0 (Normal weight) | 23 (6.9) | 6 (4.7) | 0.005 |
| 25.0–29.9 (Overweight) | 97 (29.3) | 26 (20.5) | |
| 30.0–34.9 (Obese Class 1) | 87 (26.3) | 23 (18.1) | |
| 35.0–39.9 (Obese Class 2) | 63 (19.0) | 42 (33.1) | |
| ≥40.0 (Obese Class 3) | 61 (18.4) | 30 (23.6) | |
| Race | |||
| White | 50 (14.1) | 26 (19.1) | 0.18 |
| Black | 283 (79.7) | 98 (72.1) | |
| Other | 22 (6.2) | 12 (8.8) | |
| Nulliparity | 174 (49.0) | 116 (85.3) | <0.001 |
| Gestational age at delivery, weeks | |||
| 37w0d–37w6d | 83 (23.4) | 22 (16.2) | <0.001 |
| 38w0d–38w6d | 64 (18.0) | 13 (9.6) | |
| 39w0d–39w6d | 98 (27.6) | 24 (17.6) | |
| 40w0d–40w6d | 71 (20) | 34 (25) | |
| ≥41w | 39 (11) | 43 (31.6) | |
| Indication for induction | |||
| Postdate | 26 (7.3) | 38 (27.9) | <0.001 |
| Maternalc | 114 (32.1) | 34 (25) | |
| Fetald | 170 (47.9) | 55 (40.4) | |
| Elective | 45 (12.7) | 9 (6.6) | |
| Pre-existing or Gestational diabetes | 28 (7.9) | 16 (11.8) | 0.22 |
| Chronic Hypertension | 34 (9.6) | 6 (4.4) | 0.07 |
| Hypertensive disease of pregnancy | 111 (31.3) | 53 (39.0) | 0.11 |
| Cervical dilation at induction, cmb | 1 (1–2) | 1 (0.5–1.5) | <0.001 |
| Effacement at induction, cmb | 2 (2–3) | 2 (2–3) | 0.45 |
| Station at induction, cmb | −3 (−3 to −3) | −3 (−3 to −3) | 0.44 |
| Modified Bishop score at inductionb | 3 (2–4) | 2 (2–3) | 0.006 |
| Method of Induction/Cervical Ripening | |||
| Misoprostol alone | 96 (27.0) | 33 (24.3) | 0.85 |
| Misoprostol + cervical Foley | 81 (22.8) | 31 (22.8) | |
| Cervical Foley alone | 89 (25.1) | 33 (24.3) | |
| Cervical Foley + oxytocin | 81 (22.8) | 34 (25.0) | |
| Other | 8 (2.2) | 5 (3.7) | |
Abbreviations: IQR, interquartile; BMI, body mass index; GHTN, gestational hypertension; range; PEC, preeclampsia
Data are presented as n (%) unless otherwise indicated
a
Two sided P-value based on χ2 or Fisher’s exact for categorical variables and Wilcoxon rank-sum for all continuous variables;
b
Median (inter-quartile range);
c
Examples of maternal indications include: chronic hypertension, gestational diabetes, history of venous thromboembolism, pre-gestational diabetes, pregnancy related hypertension, renal disease, systemic lupus erythematous;
d
Examples of fetal indications include: abnormal fetal testing, growth restriction, oligohydramnios