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Table 4 Testing for a trend over time in unplanned readmission or death: Unadjusted and adjusted GLM regression models of unplanned readmission or death by Aboriginal status including an interaction term for year and Aboriginal status (2005/6 to 2013/14)

From: Unplanned readmission or death after discharge for Aboriginal and non-Aboriginal people with chronic disease in NSW Australia: a retrospective cohort study

  Unplanned readmission or death with interaction term
Relative risks (RR) (95% CI)
Unadjusted RR with propensity score (PS) weight Unadjusted RR without PS weight Adjusteda RR with PS weight Adjusteda RR without PS weight Adjusteda RR with PS weight and restricted to < 75 years P-value
Aboriginal status
 Non-Aboriginal ref ref ref Ref red  
 Aboriginal 1.15 (1.11, 1.19) 1.16 (1.12, 1.20) 1.28 (1.23, 1.32) 1.28 (1.23, 1.33) 1.33 (1.27, 1.39) < 0.0001
Year 1.00 (0.99, 1.01) 1.00 (0.99, 1.01) 1.00 (0.99, 1.01) 0.99 (0.99, 1.01) 1.01 (0.99, 1.02) 0.140
Interaction term
 Year and Aboriginal status 1.00 (0.99, 1.02) 1.01 (0.99, 1.02) 1.01 (0.99, 1.02) 1.01 (1.00, 1.02) 0.99 (0.97, 1.00) 0.176
Gender    
 Male ref ref ref  
 Female 0.89 (0.86, 0.92) 0.89 (0.86, 0.92) 0.88 (0.84, 0.91) < 0.0001
Age 1.01 (1.00, 1.01) 1.01 (1.01, 1.01) 1.00 (1.00, 1.01) < 0.0001
Marital status     
 Married ref ref ref  
 Single 1.19 (1.15, 1.24) 1.20 (1.15, 1.25) 1.21 (1.16, 1.26) < 0.0001
 Widowed 1.18 (1.12, 1.23) 1.18 (1.13, 1.24) 1.24 (1.16, 1.32) < 0.0001
 Divorced/separated 1.15 (1.10, 1.21) 1.15 (1.10, 1.21) 1.20 (1.13, 1.26) < 0.0001
 Not known 0.93 (0.81, 1.07) 0.94 (0.82, 1.07) 0.97 (0.83, 1.13) 0.714
IRSD
 1st quintile - most disadvantaged ref ref ref  
 2nd quintile 0.95 (0.91, 0.99) 0.95 (0.91, 0.99) 0.95 (0.90, 1.00) 0.061
 3rd quintile 0.94 (0.90, 0.99) 0.94 (0.90, 0.99) 0.94 (0.90, 0.99) < 0.05
 4th quintile 0.92 (0.87, 0.97) 0.93 (0.87, 0.98) 0.94 (0.87, 0.98) 0.051
 5th quintile – least disadvantaged 0.88 (0.82, 0.94) 0.88 (0.82, 0.94) 0.80 (0.74, 0.87) < 0.0001
ARIA
 Highly Accessible ref ref ref  
 Accessible 0.93 (0.89, 0.97) 0.93 (0.89, 0.97) 0.94 (0.90, 0.98) > 0.01
 Moderately Accessible 0.88 (0.83, 0.93) 0.88 (0.83, 0.93) 0.86 (0.81, 0.92) < 0.0001
 Remote / Very Remote 0.67 (0.61, 0.73) 0.67 (0.61, 0.73) 0.65 (0.59, 0.72) < 0.0001
Charlson Index score
 0 ref ref ref  
 1 1.43 (1.38, 1.49) 1.43 (1.38, 1.49) 1.46 (1.40, 1.52) < 0.0001
 2+ 1.63 (1.57, 1.70) 1.63 (1.57, 1.69) 1.69 (1.62, 1.77) < 0.0001
  1. aRRs are adjusted for all variables given in the table