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Korean J Gastroenterol  <  Volume 73(6); 2019 <  Articles

Korean J Gastroenterol 2019; 73(6): 341-349  https://doi.org/10.4166/kjg.2019.73.6.341
Development of Koreans Gut Quotient Measurement Scales
Yoon Jin Choi*, Jae Ho Cho1*, Dong Ho Lee1 , Dong Jin Song1, Young Jae Kwon1, Sung Min Baek1, Yang Jin Kim1, Min Ho Jang1, Dong Han Lee2, Ha Young Park2, Min Cheol Kim2 and Ji An Yang3
Department of Internal Medicine, Korea University Guro Hospital, Seoul; Department of Internal Medicine, Seoul National University Bundang Hospital1, Seongnam; Ildong Pharmaceutical Co., Ltd.2, Sejong Cyber University Graduate School of Business3, Seoul, Korea
Correspondence to: Dong Ho Lee, Department of Internal Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam 13620, Korea. Tel: +82-31-787-7008, Fax: +82-31-787-4051, E-mail: dhljohn@yahoo.co.kr, ORCID: https://orcid.org/0000-0002-6376-410X

* The first two authors contributed equally to this work as co-first authors of this paper.
Received: January 27, 2019; Revised: May 1, 2019; Accepted: May 8, 2019; Published online: June 25, 2019.
© The Korean Journal of Gastroenterology. All rights reserved.

This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Background/Aims: The aim of this study was to develop ‘Koreans Gut Quotient Measurement Scales (GQ)’, in which Koreans respond to questionnaires about the subjective feelings and symptoms of their intestinal health status.
Methods: Among 66 items pooled from previous studies and 4 items that were added following a focus group interview, 15 items were chosen using the Delphi survey. The content validity was evaluated using the content validity ratio. Data collected from 1,120 people from the general public in Korea were analyzed to verify the reliability and validity of GQ.
Results: The finalized GQ consisted of 17 items (including two exploratory measurement items) that were classified into three independent factors based on exploratory factor analysis (EFA): ‘perceived intestine discomfort’, ‘bowel movement discomfort’, and ‘bowel movement control discomfort’. The discriminant and convergent validity of GQ were identified using EFA, reliability test, and confirmatory factor analysis. In addition, the criterion-related validity of GQ was identified using correlation and multiple regression analysis.
Conclusions: The GQ, which is a simplified intestinal health index developed based on an easy questionnaire for the public to understand, can be used as a tool for the public to evaluate their own intestinal health and determine when to visit clinics.
Keywords: Koreans Gut Quotient Measurement Scales; Scale development; Scale validity

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