Table 3 Power analysis and sample size (power = .80, alpha = .05)
Repeated measure correlation | Pre-training rate | Post-training rate | â–³ | Sample Size | ||
|---|---|---|---|---|---|---|
Screening | 0.3 | 25% | 40% | 15% | 107 | |
25% | 50% | 25% | 41 | |||
25% | 60% | 35% | 22 | |||
0.5 | 25% | 40% | 15% | 77 | ||
25% | 50% | 25% | 30 | |||
25% | 60% | 35% | 16 | |||
Brief Intervention | 0.3 | 20% | 40% | 20% | 58 | |
20% | 50% | 30% | 28 | |||
20% | 60% | 40% | 16 | |||
0.5 | 20% | 40% | 20% | 43 | ||
20% | 50% | 30% | 21 | |||
20% | 60% | 40% | 13 | |||
Referral to Treatment | 0.3 | 10% | 15% | 5% | 488 | |
10% | 20% | 10% | 142 | |||
10% | 25% | 15% | 71 | |||
0.5 | 10% | 15% | 5% | 353 | ||
10% | 20% | 10% | 104 | |||
10% | 25% | 15% | 53 |