Adverse event (AE) risk and rate
| Overall | Cardiac surgery | Intensive care | Internal medicine | Obstetrics | p value (χ2 test) | |
| Risk* N (%) | ||||||
| Patients observed | 1406 | 226 | 211 | 453 | 516 | |
| Patients with at least one AE | 192 (13.7%) | 45 (19.9%) | 52 (24.6%) | 75 (16.6%) | 20 (3.9%) | <0.001 |
| Patients with at least one preventable AE | 86 (6.1%) | 8 (3.5%) | 23 (10.9%) | 48 (10.6%) | 7 (1.4%) | <0.001 |
| Patients with at least one potential AE | 75 (5.3%) | 6 (2.7%) | 17 (8.1%) | 40 (8.8%) | 12 (2.3%) | <0.001 |
| Rate† | ||||||
| Days of observation | 9300 | 1234 | 1592 | 5026 | 1448 | |
| AE rate (per 100 patient days) | 245 (2.6) | 62 (5.0) | 72 (4.5) | 89 (1.8) | 22 (1.5) | <0.001 |
| Preventable AE rate (per 100 patient days) | 88 (0.9) | 8 (0.6) | 23 (1.4) | 50 (1.0) | 7 (0.5) | 0.03 |
| Potential AE rate (per 100 patient days) | 81 (0.9) | 7 (0.6) | 20 (1.3) | 42 (0.8) | 12 (0.8) | 0.24 |
* Risk was calculated as the number of patients with at least one event divided by the total number of patients observed.
† Rate reported as events per 100 patient days, which was calculated as the number of events divided by the number of patient days of observation multiplied by 100.