Table 2. Performance of variables in predicting 90-day mortality.
| Variable | AUC ROC | 95% CI | P | Cut-off | Sensitivity (%) | Specificity (%) |
|---|---|---|---|---|---|---|
| APACHE II score | 0.84±0.06 | 0.73–0.95 | <0.001 | ≥13.5 | 87.5 | 72.1 |
| LDHday 1 | 0.78±0.06 | 0.66–0.90 | <0.001 | ≥375 | 75 | 63.3 |
| LDHday 3 | 0.93±0.03 | 0.88–0.98 | <0.001 | ≥453 | 94 | 87 |
| LDHc | 0.85±0.06 | 0.73–0.97 | <0.001 | ≥9.2 | 75 | 90 |
| PSI score | 0.65±0.08 | 0.49–0.81 | 0.07 | ≥109.5 | 68.8 | 48.3 |
| CURB-65 | 0.64±0.09 | 0.47–0.81 | 0.09 | ≥2.5 | 50 | 80 |
AUC ROC, area under the receiver operating characteristic curve; CI, confidence interval; APACHE-II, Acute Physiology and Chronic Health Evaluation II; PSI, Pneumonia Severity Index; LDHday1, LDH level at ICU admission; LDHday3, LDH level on day 3; LDHc, LDH change from day 1 to day 3 [calculated using the following formula: LDHc (%) = (LDHday3 – LDHday1)/LDHday1 ×100%].