a sample size of 15 subjects per group provided 80% power to detect differences of 50% difference in the pressure pain threshold (PPT) between the 2 groups of interest at an alpha level of 0.05 with a two-tailed test
a sample size of 15 subjects per group provided80% power to detect differences of 50% difference in the pressurepain threshold (PPT) between the 2 groups of interest at an alphalevel of 0.05 with a two-tailed test