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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)    
   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    
   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)    
   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    
   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)