Reliability and validity of a korean version of the leicester cough questionnaire

Jae Woo Kwon, Ji Yong Moon, Sae Hoon Kim, Woo Jung Song, Min Hye Kim, Min Gyu Kang, Kyung Hwan Lim, So Hee Lee, Sang Min Lee, Jin Young Lee, Hyouk Soo Kwon, Kyung Mook Kim, Sang Heon Kim, Sang Hoon Kim, Jae Won Jeong, Cheol Woo Kim, Sang Heon Cho, Byung Jae Lee, Work Group for Chronic Cough, the Korean Academy of Asthma, Allergy and Clinical Immunology, Jae Woo Kwon, Ji Yong Moon, Sae Hoon Kim, Woo Jung Song, Min Hye Kim, Min Gyu Kang, Kyung Hwan Lim, So Hee Lee, Sang Min Lee, Jin Young Lee, Hyouk Soo Kwon, Kyung Mook Kim, Sang Heon Kim, Sang Hoon Kim, Jae Won Jeong, Cheol Woo Kim, Sang Heon Cho, Byung Jae Lee, Work Group for Chronic Cough, the Korean Academy of Asthma, Allergy and Clinical Immunology

Abstract

Purpose: There are no specific tools for measurement of the severity of chronic cough in Korea. We developed a Korean version of the Leicester Cough Questionnaire (LCQ) and tested its scaling and clinical properties.

Methods: The LCQ was adapted for Korean conditions following a forward-backward translation procedure. All patients referred to chronic cough clinics at 5 university hospitals between May 2011 and October 2013 completed 2 questionnaires, the LCQ and the Short-Form 36 (SF-36), upon presentation and completed the LCQ and the Global Rating of Change (GRC) upon follow-up visits after 2 or 4 weeks. Concurrent validation, internal consistency, repeatability, and responsiveness were determined.

Results: For the concurrent validation, the correlation coefficients (n=202 patients) between the LCQ and SF-36 varied between 0.42 and 0.58. The internal consistency of the LCQ (n=207) was high for each of the domains with a Cronbach's alpha coefficient of 0.82-0.94. The repeatability of the LCQ in patients with no change in cough (n=23) was high, with intra-class correlation coefficients of 0.66-0.81. Patients who reported an improvement in cough (n=30) on follow-up visits demonstrated significant improvement in each of the domains of the LCQ.

Conclusions: The Korean version of the LCQ is a valid and reliable questionnaire for measurement of the severity of cough in patients with chronic cough.

Keywords: Cough; chronic disease; quality of life; questionnaires.

Conflict of interest statement

There are no financial or other issues that might lead to conflict of interest.

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Source: PubMed

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