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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