Patient characteristics
| Characteristics | Survivors | Non-survivors | Total | p-values |
| Subjects n | 1102 | 88 | 1190 | |
| Age years | 77±8 | 80±7 | 77±8 | 0.006 |
| Male | 974 (88) | 85 (97) | 1059 (89) | 0.029 |
| Full support in activities of daily living | 188 (17) | 23 (26) | 211 (18) | 0.045 |
| Altered mental status | 132 (12) | 39 (44) | 171 (14) | <0.001 |
| Missing data | 8 (1) | 0 (0) | 8 (1) | |
| Systolic blood pressure mmHg | 133±26 | 125±25 | 132±26 | 0.010 |
| Missing data | 149 (14) | 5 (6) | 154 (13) | |
| Diastolic blood pressure mmHg | 75±17 | 72±16 | 75±17 | 0.130 |
| Missing data | 155 (14) | 5 (6) | 160 (13) | |
| Respiratory rate breaths·min−1 | 25±6 | 27±7 | 25±7 | <0.001 |
| Missing data | 219 (20) | 8 (9) | 227 (19) | |
| Heart rate beats·min−1 | 102±19 | 106±21 | 102±19 | 0.061 |
| Missing data | 142 (13) | 3 (3) | 145 (12) | |
| Blood urea nitrogen mg·dL−1 | 20±11 | 30±21 | 21±12 | <0.001 |
| Missing data | 13 (1) | 1 (1) | 14 (1) | |
| Blood eosinophil count·µL−1 | 99±169 | 53±123 | 96±167 | 0.068 |
| Missing data | 409 (37) | 41 (47) | 450 (38) |
Data are presented as mean±sd or n (%) unless otherwise stated.