Table 1 Total number of clusters required according to different cluster sizes and ICC (ES = 0.4, alpha = 0.05, power = 0.80).
| Â | Average size of the clusters | |||
|---|---|---|---|---|
Intraclass Correlation Coefficient | 10 | 15 | 20 | 25 |
0.01 | 22 | 16 | 12 | 10 |
0.05 | 30 | 24 | 20 | 18 |
0.10 | 38 | 32 | 30 | 28 |