Korean J Intern Med.
2017 Sep;32(5):910-915. 10.3904/kjim.2016.132.
Korean version of the Cough Symptom Score: clinical utility and validity for chronic cough
- Affiliations
-
- 1Department of Internal Medicine, Kangwon National University Hospital, Chuncheon, Korea.
- 2Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
- 3Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
- 4Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
- 5Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
- 6Department of Internal Medicine, The Armed Forces Capital Hospital, Seongnam, Korea.
- 7Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
- 8Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. leebj@skku.edu
- 9Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
- 10Department of Internal Medicine, Pogunhan Mom Hospital, Seoul, Korea.
- 11Department of Internal Medicine, Eulji General Hospital, Eulji University School of Medicine, Seoul, Korea.
- 12Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
- 13Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea.
- KMID: 2411494
- DOI: http://doi.org/10.3904/kjim.2016.132
Abstract
- BACKGROUND/AIMS
The Cough Symptom Score (CSS) is a simple, useful tool for measuring cough severity. However, there is no standard Korean version of the CSS. We developed a Korean version of the CSS and evaluated its clinical utility and validity for assessing chronic cough severity.
METHODS
The CSS was adapted for Korean use following a forward-backward translation procedure. Patients with chronic cough enrolled from five university hospitals were graded using the CSS and a 100-mm linear visual analog scale (VAS) of cough severity at each visit. Patients completed the Leicester Cough Questionnaire (LCQ) upon presentation and completed the LCQ and Global Rating of Change at follow-up visits after 2 to 4 weeks. The concurrent validity, repeatability, and responsiveness of the Korean version of the CSS were determined.
RESULTS
Correlation coefficients between the CSS and LCQ, and between the CSS and VAS, were -0.66 and 0.52, respectively. There was a weak correlation between the scores for night and day symptoms (r = 0.24, p = 0.0006). The repeatability of the CSS in patients with no change in cough (n = 23) was high (intra-class correlation coefficient, 0.75; 95% confidence interval [CI], 0.51 to 0.88). Patients who reported an improvement in cough (n = 30) at follow-up visits had a significant improvement in the CSS (median, −2; 95% CI, −3 to −1; p = 0.0003).
CONCLUSIONS
The Korean version of the CSS correlated well with other tools for accessing cough severity in chronic cough patients. Therefore, it could be a reliable method for measuring chronic cough severity.
