Rate of errors extracted from studies
| Author | Denominator | N | All infusions >1 error (%) | Adjusted to/1000 infusions | Weighted mean/1000 administrations |
| Cousins | Observed infusions | 273 | 185 (67.8) | 678 | 463 |
| Ghaleb* | Observed medication preparation and administration | 1554 | 85 (5.5) | 55 | 38 |
| O’Hare | Observed infusions | 179 | 168 (94) | 940 | 643 |
| Taxis | Observed infusions | 430 | 212 (49.3) | 493 | 337 |
| Wirtz | Observed infusions | 140 | 34 (24.3) | 243 | 166 |
| Total | 2576 | 684 | Mean errors=265 (95% CI 249 to 288) | Weighted mean errors=101 (95% CI 84 to 121) | |
*Data reported all types of error but certain intravenous error types were extractable and are presented.