ATTACHMENT 4
Power and Sample Size Calculation Table
Attachment 4
Sample Size and Power to Detect Statistically Significant Intervention Effects
Number of Sample Cluster Intervention
Communities Size Correlation Effect Power
2 100 0.01 0.2 0.14
2 300 0.01 0.2 0.18
2 500 0.01 0.2 0.19
2 1000 0.01 0.2 0.20
2 3000 0.01 0.2 0.21
4 100 0.01 0.2 0.39
4 300 0.01 0.2 0.54
4 500 0.01 0.2 0.58
4 1000 0.01 0.2 0.62
4 3000 0.01 0.2 0.64
5 100 0.01 0.2 0.50
5 300 0.01 0.2 0.67
5 500 0.01 0.2 0.72
5 1000 0.01 0.2 0.75
5 3000 0.01 0.2 0.78
6 100 0.01 0.2 0.60
6 300 0.01 0.2 0.77
6 500 0.01 0.2 0.81
6 1000 0.01 0.2 0.84
6 3000 0.01 0.2 0.87
8 100 0.01 0.2 0.75
8 300 0.01 0.2 0.90
8 500 0.01 0.2 0.94
8 1000 0.01 0.2 0.95
8 3000 0.01 0.2 0.95
10 100 0.01 0.2 0.85
10 300 0.01 0.2 0.96
10 500 0.01 0.2 0.97
10 1000 0.01 0.2 0.98
10 3000 0.01 0.2 0.99
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Calculations derived from computer program created by Donner A, Klar N. Statistical Considerations in the Design and Analysis of Community Intervention Trial. J Clin. Epidemiol. 1996;49:435-439.
| File Type | application/msword |
| File Title | Performance Measures for the REACH2010 Program: |
| Author | ycl1 |
| Last Modified By | arp5 |
| File Modified | 2008-01-02 |
| File Created | 2007-11-16 |