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Table 4 Adjusted risk ratio (RRadj and 95%CI) for maternal and perinatal outcomes from low birth weight by multiple logistic regression analysis*

From: Perinatal outcomes associated with low birth weight in a historical cohort

Outcomes RRadj (95%CI)
Amniotic fluid (AF)   
   clear 1.00  
   non-clear 0.79 (0.71-0.88)
AF amount   
   normal 1.00  
   abnormal 3.21 (2,77-3.71)
Fetal heart rate   
   normal 1.00  
   abnormal 1.97 (1.75-2.22)
Onset of labor   
   spontaneous 1.00  
   elective cesarean 2.27 (2.03-2.53)
   induction 1.62 (1.43-1.84)
Mode of delivery   
   spontaneous 1.00  
   breech 4.69 (3.18-6.91)
   forceps 0.62 (0.54-0.72)
   cesarean 1.38 (1.29-1.48)
1 st minute Apgar score   
   7 to 10 1.00  
   < 7 2.73 (2.46-3.04)
5 th minute Apgar score   
   7 to 10 1.00  
   < 7 6.69 (5.32-8.42)
Somatic gestational age   
   ≥ 37 weeks 1.00  
   < 37 weeks 20.80 (18.39-23.51)
Sex   
   male 1.00  
   female 1.08 (1.02-1.16)
Malformation   
   without 1.00  
   with 2.86 (2.24-3.64)
  1. * Results controlled by confounding factors: maternal age, schooling, body mass index, smoking and time of initiation of prenatal care