Sample size
PD
An observational study was carried out for patients undergoing PD in our institution and indicated a baseline 31 per cent CR-POPF rate. According to power calculations, 62 patients (31 per group) were required to show a decrease in CR-POPF rate from 31 to 5 per cent with 80 per cent power and two-tailed 5 per cent significance level, with assumed 10 per cent lost to follow-up.