Study sample characteristics
| Control | Intervention | Follow-up | ||||
| CTU | Hosp | CTU | Hosp | CTU | Hosp | |
| Age, mean (SD) | ||||||
| Site 1 | 63 (17) | 76 (16) | 63(17) | 78 (14) | 63 (17) | 76 (16) |
| Site 2 | 63 (20) | 70 (19) | 62(18) | 70 (17) | 59 (17) | 70 (18) |
| Site 3 | 63 (18) | 75 (17) | 64 (17) | 76 (15) | 64 (18) | 75 (17) |
| Site 4 | 64 (16) | 78 (15) | 61 (15) | 75 (15) | 62 (18) | 79 (13) |
| Sex (% male) | ||||||
| Site 1 | 56 | 54 | 57 | 47 | 57 | 51 |
| Site 2 | 53 | 54 | 53 | 55 | 44 | 56 |
| Site 3 | 62 | 60 | 55 | 49 | 59 | 46 |
| Site 4 | 55 | 44 | 56 | 43 | 65 | 44 |
| Charlson Comorbidity Index, median (IQR) | ||||||
| Site 1 | 1 (2) | 1 (2) | 1 (3) | 1 (2) | 1 (2) | 1 (2) |
| Site 2 | 1 (3) | 1 (3) | 1 (3) | 1 (2) | 1 (2) | 1 (2) |
| Site 3 | 2 (3) | 1 (2) | 1 (3) | 1 (2) | 1 (2) | 1 (2) |
| Site 4 | 2 (2) | 1 (2) | 1 (3) | 1 (2) | 1 (3) | 1 (2) |
| Length of stay, median (IQR) | ||||||
| Site 1 | 5 (8) | 7 (12 | 5 (9) | 7 (12) | 5 (7) | 5 (6) |
| Site 2 | 6 (10) | 7 (12) | 6 (8) | 6 (12) | 4 (5) | 4 (6) |
| Site 3 | 6 (18) | 9 (17) | 6 (8) | 8 (14) | 4 (5) | 5 (7) |
| Site 4 | 8 (9) | 8 (18) | 5 (6) | 7 (9) | 4 (5) | 5 (6) |
.CTU, clinical teaching unit; Hosp, hospitalist unit.