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Table 3 Odds ratios and population attributable fractions for ALRI hospitalisation before age 2 years in Aboriginal children

From: A retrospective population-based cohort study identifying target areas for prevention of acute lower respiratory infections in children

Risk factor Univariatea Adjusted Adjusted
  OR 95% CI OR 95% CI PAF % 95% CI
Gender       
   Female Reference      
   Male 1.35 1.26, 1.45 1.42 1.28, 1.58 13.3 9.4, 17.1
Gestational age       
   ≥37 weeks Reference      
   35-36 weeks 1.44 1.26, 1.64 1.39 1.15, 1.69 1.8 0.6, 2.8
   33-34 weeks 1.86 1.51, 2.29 1.71 1.27, 2.30 1.1 0.4, 1.8
   <33 weeks 2.79 2.31, 3.35 3.18 2.42, 4.16 2.9 2.1, 3.7
Percent optimal birthweight      
   Low <85% 1.65 1.39, 1.96 1.43 1.15, 1.78 5.8 2.3, 9.1
   Normal 85-114% 1.18 1.01, 1.38 1.15 0.94, 1.40 6.8 -3.3, 15.9
   High ≥115% Reference      
Number of previous pregnancies      
   0 Reference      
   1 0.97 0.86, 1.08 1.03 0.87, 1.23 0.5 -1.9, 2.8
   2 1.14 1.01, 1.28 1.39 1.15, 1.67 3.9 1.7, 6.1
   ≥3 1.28 1.16, 1.41 1.82 1.52, 2.19 16.5 11.8, 20.9
Season of birth       
   Spring Reference      
   Summer 1.22 1.10, 1.35 1.22 1.05, 1.42 3.5 0.9, 6.1
   Autumn 1.38 1.25, 1.53 1.46 1.27, 1.69 7.2 4.5, 9.9
   Winter 1.25 1.12, 1.38 1.25 1.08, 1.45 3.9 1.3, 6.4
Mode of delivery       
   Vaginal Reference      
   Instrumental 0.85 0.73, 0.98 1.23 0.99, 1.52 0.9 -0.1, 1.9
   Elective caesarean 0.92 0.80, 1.05 1.04 0.85, 1.26 0.2 -0.9, 1.3
   Emergency caesarean 1.09 0.98, 1.05 1.16 0.98, 1.37 1.3 -0.2, 2.7
Maternal smoking during pregnancy      
   No Reference      
   Yes 1.33 1.23, 1.44 1.14 1.03, 1.27 5.1 1.1, 8.9
Maternal asthma during pregnancy      
   No Reference      
   Yes 1.00 0.88, 1.14 1.05 0.89, 1.24 0.4 -0.9, 1.8
Maternal age (years)       
   ≥35 years Reference      
   30-34 years 1.09 0.92, 1.31 1.17 0.91, 1.51 1.5 -0.9, 3.8
   25-29 years 1.21 1.03, 1.43 1.36 1.07, 1.73 5.4 1.3, 9.3
   20-24 years 1.19 1.01, 1.41 1.55 1.21, 1.98 9.1 4.3, 13.6
   <20 years 1.31 1.11, 1.55 2.17 1.66, 2.85 11.2 7.8, 14.5
SEIFA Index of Disadvantageb      
   91-100% Reference      
   76-90% 0.74 0.35, 1.57 1.20 0.42, 3.38 0.2 -0.9, 1.3
   26-75% 1.21 0.61, 2.39 1.70 0.65, 4.44 9.2 -5.8, 22.0
   11-25% 1.37 0.69, 2.71 1.73 0.66, 4.51 9.3 -5.4, 22.0
   0-10% 1.67 0.84, 3.30 1.94 0.75, 5.05 18.4 -6.5, 37.4
Accessibility/Remoteness Index of Australia    
   Very remote 1.93 1.62, 2.30 2.09 1.68, 2.61 11.7 8.5, 14.8
   Remote 1.15 0.96, 1.39 1.20 0.95, 1.52 2.0 -0.5, 4.4
   Outer regional 1.36 1.14, 1.64 1.46 1.16, 1.84 4.3 1.7, 6.8
   Inner regional Reference      
   Major cities 1.02 0.86, 1.21 1.08 0.87, 1.33 2.0 -3.7, 7.4
  1. aall adjusted for birth year
  2. b 91-100% is least disadvantaged and 0-10% is most disadvantaged.