**2.2.2 Statistics**

We calculated that 105 subjects in each arm will give the study 80% power at an alpha of 0.05. We expected the percentage of subjects with good endoscopic vision to be 90% in R10 group compared to about 75% seen in our clinical practice (R6). The association between the different grades of endoscopic vision and period of fasting was assessed using the Extended Mantel-Haenszel X2 test for trend in Winpepi (Abramson, J.H. WINPEPI (PEPI-for-Windows): computer programs for epidemiologists. Epidemiologic Perspectives & Innovations 2004, 1:6). Kappa was used to calculate the degree of agreement between the endoscopist and the independent assessor who viewed the endoscopies. The p values are presented uncorrected for multiple testing.
