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A multivariate model was constructed to predict nonattendance revealing that private payer status [odds ratio (OR)=0.368, 95% confidence interval (CI) 0.225, 0.602] and prior colonoscopy (OR=0.371, 95% CI 0.209, 0.656) were associated with greater attendance rates. Chronic obstructive pulmonary disease (OR=2.034, 95% CI 1.239, 3.341), afternoon procedure time (OR=1.807, 95% CI 1.137, 2.871), and a greater interval time between the date the colonoscopy was ordered and the date the colonoscopy was scheduled to occur (OR=1.005, 95% CI 1.001, 1.009) were indepe