Adverse event frequency, by hospital type
| Hospital type | |||
|---|---|---|---|
| Variable | Small | Large | All |
| Number of admissions sampled | 792 | 782 | 1574 |
| Number of admissions associated with an adverse event | 108 | 103 | 211 |
| Crude adverse event prevalence (95% CI) | 13.6% (11.4% to 16.2%) | 13.2% (11.0% to 15.7%) | 13.4% (11.8% to 15.2%) |
| Weighted adverse event prevalence (95% CI)* | 12.4% (7.7% to 17.1%) | 12.1% (8.5% to 15.7%) | 12.2% (9.5% to 15.5%) |
| Number of adverse events | 123 | 124 | 247 |
| Number of incident adverse events (ie, excluding events occurring prior to the index admission) | 89 | 98 | 187 |
| Crude incidence of adverse events per 100 admissions (95% CI) | 11.2 (9.0 to 13.8) | 12.5 (10.2 to 15.3) | 11.9 (10.2 to 13.7) |
| Weighted incidence of adverse events per 100 admissions (95% CI)* | 9.5 (7.0 to 11.9) | 10.8 (6.0 to 15.6) | 10.3 (7.5 to 13.1) |
| Weighted percentage of adverse events that were preventable (95% CI)* | 80.1% (68.7% to 91.5%) | 68.1% (52.4% to 83.9%) | 72.7% (58.8% to 83.3%) |
*Point estimates and CIs were weighted to account for the sampling frame.