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Palatability of the colon preparation (score ≤ 3: Unpalatable; 4 or 5: Palatable). P-value for the difference in palatability between AscPEG and PEG + M is 0.03. PEG + M: PEG electrolyte solution + menthol; AscPEG: Ascorbic acid PEG electrolyte solution.
