Demographics and admission characteristics of study subjects
| Variable | Total* (N=3588) |
| Age (years) | 63.90±15.06 |
| Unknown | 90 (2.5) |
| Gender | |
| Female | 1553 (43.1) |
| Male | 1970 (54.4) |
| Unknown | 90 (2.5) |
| Race | |
| Asian | 54 (1.5) |
| African-American | 247 (6.9) |
| Caucasian | 2948 (82.2) |
| Other | 238 (6.6) |
| Unknown | 101 (2.8) |
| Hispanic | |
| Yes | 207 (5.7) |
| No | 3271 (91.2) |
| Unknown | 112 (3.1) |
| Number of admissions | 1.38±0.93 |
| Patients with readmission | 786 (21.9) |
| Medical service of first alert | |
| Surgical | 1191 (33.2) |
| Obstetrics/Gynecology | 40 (1.1) |
| Medical | 2356 (65.7) |
| Unknown | 1 (0.0) |
| ICU for first alert | 430 (12.0) |
*Mean±SD or n (%).
ICU, intensive care unit.