['We sought to assess the effect of resident involvement in flexible sigmoidoscopy on patient satisfaction and comfort.', 'Adults undergoing flexible sigmoidoscopy completed a previsit questionnaire on indication for procedure, GI-related history, and functional status. Immediately after the procedure, satisfaction and procedure comfort were assessed. Additional information collected included procedure duration, depth of sigmoidoscope penetration, and visualization of diverticuli or polyps.', 'Among 408 endoscopies, patient characteristics and procedure indications were similar between sigmoidoscopies done by residents (n = 111) or staff. There were no differences in patient satisfaction, procedure comfort, or willingness to undergo the procedure again in the future. Sigmoidoscopies involving residents averaged 5.6 min longer, even after adjusting for preparation quality, depth of insertion, specific endoscopist, and the presence of polyps or diverticuli.'] Does resident participation in flexible sigmoidoscopy affect patient satisfaction?