Table 5. Multivariable analysis of risk factors for 90-day mortality.
| Variables | Univariable analysis | Multivariable analysis | |||
|---|---|---|---|---|---|
| Odds ratio (95% CI) | P value | Odds ratio (95% CI) | P value | ||
| APACHE-II score | 1.064 (1.015–1.114) | 0.009 | 1.079 (1.024–1.138) | 0.005 | |
| Interval from AKI diagnosis to RRT initiation (days) | 1.029 (0.959–1.105) | 0.422 | 1.049 (0.972–1.133) | 0.222 | |
| Early RRT | 0.685 (0.356–1.320) | 0.258 | 0.671 (0.314–1.434) | 0.303 | |
| Serum phosphorus before RRT initiation (mmol/L) | 1.050 (0.808–1.365) | 0.714 | 1.210 (0.728–2.011) | 0.462 | |
| BUN on ICU admission (mmol/L) | 0.961 (0.932-0.991) | 0.010 | 0.943 (0.910–0.978) | <0.01 | |
CI, confidence interval; APACHE-II, acute physiology and chronic health evaluation-II; AKI, acute kidney injury; RRT, renal replacement therapy; BUN, blood urea nitrogen; ICU, intensive care unit.