2.6. Sample size
adenomas
ADENOMAS
We aimed to provide prospective high-quality data on whether cecal retroflexion observed during colonoscopy can reduce missed adenomas in the ascending colon, as no retrospective reports had suggested this. However, due to the exceptional circumstances of a China and even global pandemic collapsing hospital care, this randomized controlled trial (RCT) was conducted without a sample size calculation based on expectations of statistically significant differences. Nonetheless, the final sample size does not affect the significance of the trial’s scientific impact.