Time frame: Each subject was assessed from the time they were scheduled for their colonoscopy to the day of their procedure, up to three months for subjects. Subjects were scored on their colonoscopies immediately following the procedure once the patient was stable
Prep quality was measured with the validated Boston Scoring Scale. A score of 0, 1, 2 or 3 is given to the right, transverse and left colon based on the amount and consistency of stool visualized as well as the ease or difficulty of guiding endoscopic instrumentation during a colonoscopy. Higher scores indicate a cleaner colon and as per Lai, a Boston Score of 7 or above indicates an "excellent" prep. To eliminate bias, the four grading gastroenterologists did not know whether subjects had used written or app instructions.