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Table 3 Unadjusted and adjusted Poisson regression models for the number of avoidable admissions calculated for each financial year of the study period (2005/06–2013/14) by Aboriginal status and explanatory factors (n = 19,025)

From: Frequent avoidable admissions amongst Aboriginal and non-Aboriginal people with chronic conditions in New South Wales, Australia: a historical cohort study

  Number of avoidable admissions
Incidence rate ratios (IRR) (95% CI)
Unadjusted IRR Adjusted IRR Adjusted IRR & restricted to < 75 years P-value
Aboriginal status     < 0.0001
 Non-Aboriginal ref. ref. ref.  
 Aboriginal 1.15 (1.12, 1.18) 1.16 (1.13, 1.20) 1.15 (1.11, 1.20)  
Financial year     0.397*
 2005–06 ref. ref. ref.  
 2006–07 1.00 (0.94, 1.05) 1.00 (0.94, 1.05) 1.00 (0.93, 1.05)  
 2007–08 0.96 (0.91, 1.01) 0.96 (0.91, 1.01) 0.94 (0.89, 1.00)  
 2008–09 0.97 (0.92, 1.03) 0.97 (0.92, 1.02) 0.95 (0.90, 1.01)  
 2009–10 0.96 (0.91, 1.01) 0.97 (0.92, 1.02) 0.94 (0.88, 0.99)  
 2010–11 0.96 (0.91, 1.02) 0.96 (0.91, 1.01) 0.95 (0.89, 1.00)  
 2011–12 0.98 (0.93, 1.03) 0.97 (0.92, 1.02) 0.96 (0.91, 1.02)  
 2012–13 0.99 (0.94, 1.04) 0.98 (0.93, 1.03) 0.97 (0.92, 1.03)  
 2013–14 0.98 (0.93, 1.04) 0.97 (0.93, 1.03) 0.96 (0.90, 1.01)  
Sex
 Male ref. ref.  
  Female 1.00 (0.97, 1.02) 1.02 (0.99, 1.04) 0.270
Age 1.00 (1.00, 1.00) 1.00 (1.00, 1.01) < 0.0001
Marital status
 Married ref. ref.  
 Single 1.06 (1.03, 1.10) 1.09 (1.05, 1.12) < 0.0001
 Widowed 1.04 (1.00, 1.08) 1.09 (1.04, 1.14) 0.001
 Divorced/separated 1.09 (1.05, 1.13) 1.09 (1.04, 1.13) < 0.0001
 Not known 0.98 (0.89, 1.09) 0.99 (0.88, 1.11) 0.833
Index of relative socio-economic disadvantage (IRSD)
 1st quintile – most disadvantaged ref. ref.  
 2nd quintile 0.98 (0.95, 1.02) 0.99 (0.96, 1.03) 0.787
 3rd quintile 0.99 (0.95, 1.03) 0.99 (0.95, 1.04) 0.744
 4th quintile 0.97 (0.93, 1.01) 0.99 (0.94, 1.04) 0.563
 5th quintile – least disadvantaged 0.92 (0.87, 0.97) 0.88 (0.82, 0.95) 0.001
Accessibility/remoteness index of Australia (ARIA)
 Highly Accessible ref. ref.  
 Accessible 0.97 (0.94, 1.00) 0.96 (0.93, 0.99) < 0.05
 Moderately Accessible 0.98 (0.94, 1.02) 0.95 (0.91, 0.99) < 0.05
 Remote / Very Remote 1.02 (0.97, 1.08) 1.00 (0.95, 1.06) 0.924
  1. aPost estimation Wald test for financial year term