Sample size calculation
colorectal cancer
COLORECTAL CANCER
To detect an effect size (Cohen’s d = 0.8), we initially calculated a required sample size of 52. However, anticipating an expected dropout rate of 20%, we enrolled a final sample size of 64 (32 per group) in our study. Our analysis identified an effect size of d = 0.8 with 0.80 power and a two-tailed overall type I error rate of 0.05. We based our power calculation on a previous study with a similar exercise protocol and primary outcome measure in colorectal cancer patients, which reported an effect size of 0.77 (LOS = 7.82 ± 1.07 days in the exercise group, 9.86 ± 2.66 days in the usual care group) [