Table 2 |
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Power of trial to detect differences across main comparisons |
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Power to detect difference of 2.5 RMDQ points at 1% significance level |
No interaction present between manipulation and exercise |
Interaction present between manipulation and exercise |
Analysing only completersa (no interactions present) |
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Exercise vs. AM only |
>99% |
>99% |
>99% |
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Manipulation vs. AM only |
>99% |
>99% |
>99% |
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Site of manipulationb |
80% |
42% |
64% |
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Site of manipulationc |
91% |
66% |
83% |
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a Based on estimated completion rate of 75% b Power to detect difference of 1.67 RDQ points at 1% significance level c Power to detect difference of 1.67 RDQ points at 5% significance level |
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UK Back pain Exercise And Manipulation (UK BEAM) Trial Team BMC Health Services Research 2003 3:16 doi:10.1186/1472-6963-3-16 |
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