Fewer Polyps Detected by Colonoscopy as the Day Progresses at a Veteran's Administration Teaching Hospital  Michael Y. Chan, Hartley Cohen, Brennan M.R. Spiegel  Clinical Gastroenterology and Hepatology  Volume 7, Issue 11, Pages 1217-1223 (November 2009) DOI: 10.1016/j.cgh.2009.07.013 Copyright © 2009 AGA Institute Terms and Conditions

Figure 1 Mean number of histologically confirmed polyps per patient by time period. Each bar depicts the proportion of hyperplastic vs adenomatous polyps identified by time period. There is a graded decrease in the mean number of polyps per patient as the endoscopic work shift progresses (P = .03). There is no significant difference in the proportion of adenomatous vs hyperplastic polyps removed (P = .24). Clinical Gastroenterology and Hepatology 2009 7, 1217-1223DOI: (10.1016/j.cgh.2009.07.013) Copyright © 2009 AGA Institute Terms and Conditions