Table 1 Demographic variables (n = 91)
Maternal age (yrs) | 24.9 (4.8) | Range: 18-36 |
Gestational age at delivery (days) | 276.1 (7.1) | Range: 259-290 |
Hispanic | Â | Â |
 Yes | 5 (5.5%) |  |
 No | 86 (94.5%) |  |
Race | Â | Â |
 White | 66 (72.5%) |  |
 Black | 18 (19.8%) |  |
 Other | 7 (7.7%) |  |
Marital status | Â | Â |
 Married | 41 (45.1%) |  |
 Not married | 50 (54.9%) |  |
Body mass index (maternal) | 29.9 (4.6) | Range: 18.0-41.7 |
Cervical dilatation at admission (cm) | 3.6 (0.5) | Range: 3.0-5.0 |
Cervical effacement at admission | Â | Â |
 50% – < 80% | 11 (12.1%) |  |
 ≥ 80% | 80 (87.9%) |  |
Mode of birth | Â | Â |
 Vaginal | 81 (89.0%) |  |
 Cesarean | 10 (11.0%) |  |
Membrane rupture type | Â | Â |
 Spontaneous | 33 (36.3%) |  |
 Amniotomy within 4 hrs of admission | 41 (45.0%) |  |
 Amniotomy at > 4 hrs after admission | 17 (18.7%) |  |
Oxytocin augmentation | Â | Â |
 No | 33 (36.3%) |  |
 Yes, within 4 hrs of admission | 27 (29.7%) |  |
 Yes, at > 4 hrs after admission | 31 (34.0%) |  |
Epidural use | Â | Â |
 No | 5 (5.5%) |  |
 Yes | 86 (94.5%) |  |
In-hospital labor duration (hr)* | 8.9 (3.7) | Range: 2.8-20.9 |
Weight (infant) (g) | 3392.8 (460.9) | Range: 2329-4722 |
Length (infant) (cm) | 49.5 (2.2) | Range: 44.0-54.5 |