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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.
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