Table 1 Crude estimates of risks (RR and 95%CI) for labor outcomes according to birth weight
From: Perinatal outcomes associated with low birth weight in a historical cohort
Outcomes | Low birth weight n (%) | Normal birth weight n (%) | RR (95%CI) |
|---|---|---|---|
Amniotic fluid (AF) | Â | Â | Â |
   Clear | 5,012 (77.4) | 28,369 (75.7) | 1.00 |
   Meconium | 834 (12.9) | 7,712 (20.6) | 0.67 (0.62-0.71) |
   Hemorrhagic | 156 (2.4) | 169 (0.5) | 5.10 (4.11-6.32) |
   Infectious | 123 (1.9) | 108 (0.3) | 6.32 (4.89-8.16) |
   Unknown | 352 (5.4) | 1,109 (3.0) |  |
AF volume | Â | Â | Â |
   Normal | 5,113 (78.9) | 34,297 (91.5) | 1.00 |
   Oligohydramnios | 749 (11.6) | 1,104 (2.9) | 4.10 (3.75-4.48) |
   Polyhydramnios | 147 (2.3) | 444 (1.2) | 2.19 (1.82-2.63) |
   Unknown | 468 (7.2) | 1,622 (4.3) |  |
Fetal heart rate (FHR) | Â | Â | Â |
   Normal | 4,481 (69.2) | 30,687 (81.9) | 1.00 |
   Tachycardia (>160) | 124 (1.9) | 273 (0.7) | 3.05 (2.48-3.77) |
   Early/variable decelaration | 345 (5.3) | 2,164 (5.8) | 1.09 (0.97-1.21) |
   Late decelaration/bradycardia | 1,010 (15.6) | 3,079 (8.2) | 2.02 (1.89-2.15) |
   Unknown | 517 (8.0) | 1,264 (3.4) |  |
Onset of labor | Â | Â | Â |
   Spontaneous | 3,915 (60.4) | 29,282 (78.2) | 1.00 |
   Elective Cesarean section | 1,580 (24.4) | 3,906 (10.4) | 2.44 (2.32-2.57) |
   Induction | 883 (13.6) | 3,834 (10.2) | 1.59 (1.49-1.70) |
   Unknown | 99 (1.5) | 445 (1.2) |  |
Total | 6,477 (100.0) | 37,467 (100.0) | Â |