Effect of socioeconomic quintile and geographic location on hospital usage in Indigenous and non-Indigenous preterm infants postdischarge from birth admission to 11 months, 2010–2011
| Indigenous | Non-Indigenous | |||||||
|---|---|---|---|---|---|---|---|---|
| Events | Time at risk | (Events/risk)×1000 | aIRR×(95% CI)* | Events | Time at risk | (Events/ risk)×1000 | aIRR×(95% CI)* | |
| Hospital admissions | ||||||||
| Socioeconomic status | ||||||||
| Most disadvantaged 1 | 300 | 56 795 | 5.28 | 1.29 (0.93 to 1.80) | 167 | 46 484 | 3.59 | 1.04 (0.85 to 1.28) |
| 2 | 98 | 20 178 | 4.86 | 1.08 (0.74 to 1.58) | 695 | 207 676 | 3.35 | 0.97 (0.84 to 1.12) |
| 3 | 88 | 19 685 | 4.47 | 0.92 (0.61 to 1.38) | 577 | 170 526 | 3.38 | 0.99 (0.91 to 1.09) |
| 4 | 130 | 26 672 | 4.87 | 1.12 (0.68 to 1.84) | 1314 | 377 420 | 3.48 | 1.01 (0.94 to 1.09) |
| Least disadvantaged 5 | 97 | 22 800 | 4.25 | 1.00 | 1679 | 502 239 | 3.34 | 1.00 |
| p Value trend 0.654 | p Value trend 0.835 | |||||||
| Geographic location | ||||||||
| Most remote | 331 | 66 865 | 4.95 | 1.51 (1.10 to 2.06) | 236 | 80 154 | 2.94 | 0.95 (0.82 to 0.10) |
| Outer regional | 117 | 20 521 | 5.70 | 1.56 (1.02 to 2.39) | 390 | 94 722 | 4.12 | 1.23 (1.10 to 1.37) |
| Inner regional | 159 | 28 882 | 5.51 | 1.58 (1.14 to 2.21) | 1823 | 523 635 | 3.48 | 1.05 (0.98 to 1.12) |
| Major city | 106 | 29 861 | 3.55 | 1.00 | 1983 | 605 834 | 3.27 | 1.00 |
| p Value trend 0.043 | p Value trend 0.252 | |||||||
| Emergency presentations | ||||||||
| Socioeconomic status | ||||||||
| Most disadvantaged 1 | 544 | 56 795 | 9.58 | 1.03 (0.74 to 1.41) | 265 | 46 484 | 5.70 | 1.79 (1.51 to 2.12) |
| 2 | 108 | 20 178 | 5.35 | 0.57 (0.40 to 0.81) | 688 | 207 676 | 3.31 | 1.12 (0.94 to 1.33) |
| 3 | 159 | 19 685 | 8.08 | 0.87 (0.62 to 1.22) | 679 | 170 526 | 3.98 | 1.30 (1.10 to 1.55) |
| 4 | 167 | 26 672 | 6.26 | 0.63 (0.43 to 0.94) | 1297 | 377 420 | 3.44 | 1.14 (0.95 to 1.38) |
| Least disadvantaged 5 | 207 | 22 800 | 9.08 | 1.00 | 1396 | 502 239 | 2.78 | 1.00 |
| p Value trend 0.004 | p Value trend 0.178 | |||||||
| Geographic location | ||||||||
| Most remote | 641 | 66 865 | 9.59 | 1.92 (1.53 to 2.40) | 388 | 80 154 | 4.84 | 1.61 (1.31 to 1.99) |
| Outer regional | 178 | 20 521 | 8.67 | 1.65 (1.31 to 2.09) | 446 | 94 722 | 4.71 | 1.48 (1.23 to 1.78) |
| Inner regional | 206 | 28 882 | 7.13 | 1.38 (1.02 to 1.86) | 1770 | 523 635 | 3.38 | 1.08 (0.94 to 1.23) |
| Major city | 160 | 29 861 | 5.36 | 1.00 | 1721 | 605 834 | 2.84 | 1.00 |
| p Value trend <0.001 | p Value trend <0.001 | |||||||
*Adjusted for maternal age, gravidity, sex of child, birth weight.
aIRR, adjusted incidence rate ratio.