Table 2.
Intrapartum Characteristics
| Characteristic | Cases (n=159) | Controls (n=318) | P value |
|---|---|---|---|
| Type of labor: | 0.21 | ||
| Spontaneous | 96 (60.4%) | 215 (67.6%) | |
| Induction | 63 (39.6%) | 103 (32.4%) | |
| Duration 1st stage labor (hr)a | |||
| < 11 | 90 (72.0%) | 199 (78.7%) | 0.17 |
| 11–15.9 | 17 (13.6%) | 33 (13.0%) | |
| ≥ 16 | 18 (14.4%) | 21 (8.3%) | |
| Duration 2nd stage labor (hr)b | 0.002 | ||
| 0 – 1.9 | 109 (70.3%) | 257 (82.1%) | |
| 2 – 2.9 | 18 (11.6%) | 32 (10.2%) | |
| ≥ 3 | 28 (18.1%) | 24 (7.7%) | |
| Duration 3rd stage labor (min)c | 5 [3 – 8] | 5 [3 – 7] | 0.58 |
| Oxytocin augmentation | 95 (59.8%) | 203 (63.8%) | 0.38 |
| Highest oxytocin infusion rate before delivery (mU/min) |
0.002 | ||
| 0 | 64 (40.3%) | 116 (36.5%) | |
| 1 – 7 | 32 (20.1%) | 111 (34.9%) | |
| ≥ 8 | 63 (39.6%) | 91 (28.6%) | |
| Duration of oxytocin augmentation (hr) |
0.008 | ||
| 0 | 64 (40.3%) | 116 (36.5%) | |
| 1 – 7 | 32 (20.1%) | 106 (33.3%) | |
| ≥ 7.1 | 63 (39.6%) | 96 (30.2%) | |
| Chorioamnionitis | 15 (9.4%) | 22 (6.9%) | 0.35 |
| Magnesium infusion | 20 (12.6%) | 21 (6.6%) | 0.03 |
| Time of delivery | 0.79 | ||
| Weekday daytime | 40 (25.2%) | 88 (27.7%) | |
| Weekday nighttime | 69 (43.4%) | 138 (43.4%) | |
| Weekend | 50 (31.5%) | 92 (28.9%) | |
| Mode of anesthesia | 0.46 | ||
| None | 36 (22.6%) | 58 (18.2%) | |
| Epidural | 79 (49.7%) | 160 (50.3%) | |
| Spinal or CSE | 44 (27.7%) | 100 (31.5%) | |
| Type of delivery | 0.29 | ||
| Spontaneous | 139 (87.4%) | 288 (90.6%) | |
| Instrumental (Forceps or Suction) |
20 (12.6%) | 30 (9.4%) | |
| Episiotomy | 14 (8.8%) | 13 (4.1%) | 0.04 |
| Genital tract lacerationd | 117 (73.6%) | 240 (75.5%) | 0.61 |
Data presented as n (%), median [interquartile range]
CSE=combined spinal-epidural
a
Data missing for 34 cases and 65 controls
b
Data missing for 4 cases and 9 controls
c
Data missing for 1 case and 9 controls
d
Data missing for 1 control