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)
| 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 |
aPost estimation Wald test for financial year term