Table 1. Sociodemographic Characteristics of Training and Test Sets.
| Characteristic | Patients, No. (%) | P value | ||
|---|---|---|---|---|
| Training (n = 1877) | Test (n = 634) | Total (n = 2511) | ||
| Hospital type | ||||
| Academic medical centers | 992 (52.9) | 356 (56.2) | 1348 (53.7) | .15 |
| Community hospitals | 885 (47.1) | 278 (43.8) | 1163 (46.3) | |
| Age at admission, mean (SD), y | 62.1 (19.3) | 64.4 (18.0) | 62.6 (19.0) | .007 |
| Age group, y | ||||
| <30 | 99 (5.3) | 22 (3.5) | 121 (4.8) | <.001 |
| 30-39 | 189 (10.1) | 50 (7.9) | 239 (9.5) | |
| 40-49 | 226 (12.0) | 49 (7.7) | 275 (11.0) | |
| 50-59 | 309 (16.5) | 111 (17.5) | 420 (16.7) | |
| 60-69 | 316 (16.8) | 153 (24.1) | 469 (18.7) | |
| 70-79 | 324 (17.3) | 102 (16.1) | 426 (17.0) | |
| ≥80 | 414 (22.1) | 147 (23.2) | 561 (22.3) | |
| Male sex | 983 (52.4) | 294 (46.4) | 1277 (50.9) | .009 |
| Race | ||||
| Asian | 70 (3.7) | 25 (3.9) | 95 (3.8) | <.001 |
| Black | 209 (11.1) | 219 (34.5) | 428 (17.0) | |
| Other | 318 (16.9) | 71 (11.2) | 389 (15.5) | |
| Unknown | 175 (9.3) | 70 (11.0) | 245 (9.8) | |
| White | 1105 (58.9) | 249 (39.3) | 1354 (53.9) | |
| Hispanic ethnicity | 563 (30.0) | 116 (18.3) | 679 (27.0) | <.001 |
| Charlson comorbidity index, mean (SD) | 2.559 (3.254) | 2.836 (3.607) | 2.629 (3.348) | .07 |
| ICU admission | 161 (8.6) | 54 (8.5) | 215 (8.6) | .96 |
| Mechanical ventilation | 129 (6.9) | 35 (5.5) | 164 (6.5) | .23 |
| Death | 209 (11.1) | 83 (13.1) | 292 (11.6) | .18 |
| COVID-19–associated severe outcome (ICU, mechanical ventilation, or death) | 338 (18.0) | 116 (18.3) | 454 (18.1) | .87 |
| Discharged to SNF or rehab | 253 (40.6) | 771 (42.1) | 1024 (41.7) | .51 |
Abbreviations: COVID-19, coronavirus disease 2019; ICU, intensive care unit; rehab, rehabilitation; SNF, skilled nursing facility.