Table 5 Sample size calculations based on detecting a 10-minute differences in weekday MVPA and two arm trial
From: Bristol Girls Dance Project Feasibility Trial: outcome and process evaluation results
Outcomea | ICCb | α | Power (β) | N required | N inflated for attrition | n schools/arm | Total n schoolsd |
|---|---|---|---|---|---|---|---|
MVPA/weekday (min) | 0.087 | 5% | 80% | 236 | 295 | 7 | 14 |
MVPA/weekday (min) | 0.087 | 5% | 90% | 314 | 393 | 9 | 18 |
MVPA/weekday (min) | 0.087 | 1% | 90% | 440 | 550 | 12 | 24 |