Change in task duration (%) detectable with 80% power, assuming 320 h of observations divided equally between intervention and control wards in a controlled before-and-after design
| CV of task duration | Number of tasks per hour (for given activity) | |||||
|---|---|---|---|---|---|---|
| 5 | 10 | 15 | 20 | 25 | 30 | |
| 0.5 | 13.3 | 9.4 | 7.7 | 6.6 | 5.9 | 5.4 |
| 1.0 | 26.6 | 18.8 | 15.3 | 13.3 | 11.9 | 10.9 |
| 1.5 | 39.9 | 28.1 | 23.0 | 19.9 | 17.8 | 16.3 |
| 2.0 | 53.2 | 37.5 | 30.7 | 26.6 | 23.8 | 21.7 |
CV, coefficient of variation.