Table 2

Power of trial to detect differences across main comparisons

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)


Exercise vs. AM only

>99%

>99%

>99%

Manipulation vs. AM only

>99%

>99%

>99%

Site of manipulationb

80%

42%

64%

Site of manipulationc

91%

66%

83%


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

UK Back pain Exercise And Manipulation (UK BEAM) Trial Team BMC Health Services Research 2003 3:16   doi:10.1186/1472-6963-3-16

Open Data