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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.