Table 1.
Prescribing error and medication administration error power calculations
| Error rate pre-(SD) | Error rate post-(SD) | Per cent changes from past eMM study (%) | ICC7 | Mean No. of admissions or administrations/study step | No. of steps (k) | Minimum No. wards required | No. of wards | Minimum Per cent change detectable (%) | Maximum power (%) | |
|---|---|---|---|---|---|---|---|---|---|---|
| Prescribing errors (per admission) | 4.1 (5.3) | 1.6 (2.9) | 60 | 0.06 | 14 | 10 | 1 | 8 | 20 | 100 |
| ADEs (per admission) | 0.3 (0.7) | 0.1 (0.4) | 44 | 0.005 | 14 | 10 | 7 | 8 | 42 | 83 |
| MAEs (per administration) | 0.4 (0.6) | 0.3 (0.5) | 27 | 0.03 | 30 | 10 | 4 | 8 | 20 | 97 |
| ADEs (% all medication administrations) | 4.2% | 1.8% | 57 | 0.003 | 30 | 10 | 6 | 8 | 48 | 93 |
ADE, adverse drug event; eMM, electronic medication management; ICC, intraclass correlation coefficient; MAE, medication administration error; No., number.