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Table 3 Regression model of infant mortality, Indigenous children

From: Determinants of infant mortality for children of women prisoners: a longitudinal linked data study

 

Model 1

Model 2

Model 3

Model 4

RR

(95% CI)

p-value

RR

(95% CI)

p-value

RR

(95% CI)

p-value

RR

(95% CI)

p-value

Maternal corrections history

Prison (before pregnancy*)

1.83

(1.36–2.47)

<.001

1.99

(1.49–2.67)

<.001

2.03

(1.51–2.71)

<.001

2.10

(1.57–2.81)

<.001

Prison (during pregnancy)

2.55

(1.69–3.86)

<.001

2.96

(1.98–4.43)

<.001

3.01

(2.01–4.51)

<.001

3.10

(2.07–4.64)

<.001

Prison (after birth only)

1.55

(1.18–2.03)

0.001

1.64

(1.25–2.14)

<.001

1.67

(1.28–2.18)

<.001

1.73

(1.32–2.25)

<.001

Community-only

1.38

(1.07–1.77)

0.012

1.41

(1.10–1.81)

0.007

1.42

(1.11–1.83)

0.006

1.45

(1.13–1.87)

0.003

No corrections history

ref.

           

Demographic factors

Birth year

0.96

(0.95–0.97)

<.001

0.96

(0.95–0.98)

<.001

0.96

(0.95–0.98)

<.001

0.97

(0.95–0.98)

<.001

Sex

Male

1.21

(1.01–1.47)

0.044

1.22

(1.01–1.47)

0.039

1.22

(1.01–1.47)

0.038

1.22

(1.01–1.48)

0.036

Female

ref.

           

Socioeconomic status

Very low (0–5%)

2.11

(1.35–3.31)

0.001

2.08

(1.33–3.27)

0.001

2.1

(1.34–3.30)

0.001

2.11

(1.34–3.31)

0.001

Low (6–25%)

1.88

(1.21–2.91)

0.005

1.86

(1.20–2.88)

0.006

1.87

(1.20–2.89)

0.005

1.91

(1.23–2.96)

0.004

Medium (26–50%)

1.75

(1.10–2.80)

0.018

1.74

(1.09–2.78)

0.02

1.75

(1.10–2.79)

0.019

1.78

(1.11–2.83)

0.016

High (51–100%)

ref.

           

Baseline pregnancy risk factors

Multiple gestation

Yes

2.29

(1.51–3.46)

<.001

2.37

(1.57–3.59)

<.001

2.58

(1.71–3.88)

<.001

   

No

ref.

           

Birth spacing

< 18 months

1.52

(1.19–1.93)

0.001

1.57

(1.24–2.00)

<.001

1.60

(1.26–2.03)

<.001

   

Firstborn/18 months+

ref.

           

Pregnancy complications

Abruptio placentae and other disordersa

Yes

2.85

(1.46–5.59)

0.002

2.92

(1.49–5.72)

0.002

      

No

ref.

           

Premature rupture of membranes

Yes

1.66

(1.18–2.35)

0.004

1.67

(1.18–2.37)

0.003

      

No

ref.

           

Other maternal factors/exposures in pregnancy

Substance use related service contact

Yes

1.71

(1.02–2.87)

0.042

         

No

ref.

           

External injury related hospitalisation

Yes

1.20

(0.86–1.68)

0.283

         

No

ref.

           

Sibling with Child Protection contact

Yes

1.57

(1.07–2.31)

0.022

         

Firstborn/No

ref.

           

Observations

25,875

  

25,875

  

25,875

  

265,875

  

AIC

0.1640

  

0.1642

  

0.1646

  

0.1656

  
  1. *Prison before, but not during, pregnancy
  2. aExcludes placenta previa
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