Patients were divided into two groups based on their pre-colonoscopy treatment: prepared and unprepared. To remove clots, stool, and blood and sufficiently clean the colon, patients in the prepared group underwent a 2- to 4-hour oral sulfate purge with 2 to 4 L of PEG (Niflec, Ajinomoto, Tokyo, Japan). The unprepared group did not undergo this regimen before colonoscopy.
The time from admission to starting colonoscopy (TMS) was defined as the period (hours) from admission to starting colonoscopy. In the prepared cases, TMS included the period when preparing with oral sulfate purge with 2 to 4 L of PEG
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