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Table 4 Hierarchical logistic regression results for newborn outcomes

From: Distance matters: a population based study examining access to maternity services for rural women

  Perinatal Mortality
N = 49,402
Prematurity
N = 49,402
NICU 2 Admissions
N = 36,805
  OR 95% CI OR 95% CI OR 95% CI
Step 1: Maternal Risk Factors       
   Maternal Age < 16 or > 35 1.62 (1.23, 2.14) ** 1.25 (1.14, 1.38) *** 1.22 (1.03, 1.45)*
   Nulliparity 1.38 (1.09, 1.72) ** 1.33 (1.24, 1.45) *** 1.40 (1.23, 1.58) ***
   Previous stillbirth 2.68 (1.30, 5.54) ** NA NA NA NA
   Previous neonatal death 2.25 (0.81, 6.18) NA NA NA NA
   Previous premature birth NA NA 4.49 (4.00, 5.03) *** NA NA
   Antepartum hemorrhage > 20 wks 8.29 (5.51, 12.44) *** 7.50 (6.23, 9.03) *** 5.97 (4.41, 8.10) ***
   Diabetes (Pre-existing and/or gestational) 0.79 (0.42, 1.49) 1.87 (1.62, 2.17) *** 3.17 (2.57, 3.91) ***
Step 2: Ecological risk factors       
   Social vulnerability 1.86 (1.24, 2.78) ** 1.12 (0.99, 1.27) 8.79 (6.91, 11.17) ***
   Proportion Aboriginal 0.73 (0.24, 2.24) 1.18 (0.79, 1.76) 0.19 (0.09, 0.39) ***
Step 3: Obstetric Service Level       
   Level 1 3.17 (1.45, 6.95) ** 1.11 (0.78, 1.59) 1.07 (0.54, 2.12)
   Level 2 0.92 (0.33, 2.53) 0.94 (0.70, 1.27) 0.31 (0.14, 0.65) ***
   Level 3 1.04 (0.48, 2.22) 1.12 (0.89, 1.41) 2.20 (1.59, 3.05) ***
   Level 4 1.44 (1.08, 1.93)* 0.85 (0.77, 0.95) ** 0.70 (0.58, 0.85) ***
   Level 5 1.46 (1.05, 2.03)* 0.89 (0.79, 0.99)* 0.35 (0.25, 0.50) ***
  1. * P-value < .05 ** P-value < .01 *** P-value < .001
  2. NA - the variable was not included in the model as the clinical association was not felt to be strong enough to justify inclusion.