Mortality in the propensity score matched cohort by risk-strata (quartiles) at presentation
| Risk quartile based on predicted risk at presentation* | 30-day mortality | Long-term mortality† | ||||||
|---|---|---|---|---|---|---|---|---|
| Overall quartile (%) | Transfer | Non-transfer | HR (95% CI)‡ | Overall quartile (%) | Transfer | Non-transfer | HR (95% CI)‡ | |
| Quartile 1 (n=4239) | 0.50 | 9/1984 | 12/2255 | 0.42 (0.19 to 0.96) | 3.4 | 59/1984 | 85/2255 | 0.71 (0.52 to 0.95) |
| Quartile 2 (n=4239) | 1.3 | 25/2232 | 28/2007 | 0.64 (0.42 to 0.97) | 8.7 | 167/2232 | 201/2007 | 0.75 (0.63 to 0.91) |
| Quartile 3 (n=4239) | 2.8 | 53/2252 | 64/1987 | 0.67 (0.51 to 0.95) | 19.3 | 361/2252 | 458/1987 | 0.67 (0.68 to 0.76 |
| Quartile 4 (n=4239) | 14.0 | 206/2010 | 387/2229 | 0.62 (0.52 to 0.75) | 43.1 | 705/2010 | 1123/2229 | 0.60 (0.54 to 0.66) |
*The entire propensity score matched cohort (n=16 956, 8478 transferred and 8478 non-transferred patients) was stratified into four quartiles of equal patient number based on estimated risk of 30-day mortality at presentation. No interaction between risk-strata were observed for 30-day mortality or for long-term mortality (both p for interaction >0.05).
†Mortality at a median follow-up time of 3.5 years (min 1.5 years, max 5.5 years).
‡HR shown is for transfer group compared with the non-transfer group as the referent group.