Figure 1: Flow of patients through the study. In the No-SMS group, patients took the first 2 L of PEG solution between 6 and 8 PM on the day before colonoscopy and the second 2 L of PEG approximately 6 hours before the colonoscopy with no SMS reminder. In the SMS group, patients took first 2 L of PEG in the same manner as the No-SMS group and the second dose of PEG 2 L after receiving an SMS 6 hours before an afternoon colonoscopy. PEG, polyethylene glycol; SMS, short message service of cellular phone.