Sample size
The sample size calculation was based on Metz et al. (2017) study results and on the assumption that a moderately strong association (r = 0.6) will be seen at the end of the clinical training between students’ self-assessment score and CE score in the IG, while no such association will be seen in the control group (CG). Thus, with a type I error of 5% and a power of 80%, the required sample size was 40 students.