Table 3. The score range, mean as well as floor and ceiling effects and skewness of each item in the Korean version of as VAS-IBS questionnaire & internal consistency of the VAS-IBS (Cronbach alpha).

VAS-IBS, visual analogue scale for irritable bowel syndrome questionnaire; GI, gastrointestinal.

^a)% at floor: percentage of respondents at the lowest possible scale score. ^b)% at ceiling: percentage of respondents at the highest possible scale score.