title: Korean version of the Cough Symptom Score: clinical utility and validity for chronic cough.
abstract: OBJECTIVE
  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.
authors.affiliation: Department of Internal Medicine, Kangwon National University Hospital, Chuncheon, Korea.
authors.forename: Jae-Woo
authors.initials: JW
authors.lastname: Kwon
authors.affiliation: Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
authors.forename: Ji-Yong
authors.initials: JY
authors.lastname: Moon
authors.affiliation: Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.|Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Sae-Hoon
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Woo-Jung
authors.initials: WJ
authors.lastname: Song
authors.affiliation: Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
authors.forename: Min-Hye
authors.initials: MH
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Min-Gyu
authors.initials: MG
authors.lastname: Kang
authors.affiliation: Department of Internal Medicine, The Armed Forces Capital Hospital, Seongnam, Korea.
authors.forename: Kyung-Hwan
authors.initials: KH
authors.lastname: Lim
authors.affiliation: Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: So-Hee
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
authors.forename: Sang Min
authors.initials: SM
authors.lastname: Lee
authors.affiliation: Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Lee
authors.affiliation: Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
authors.forename: Hyouk-Soo
authors.initials: HS
authors.lastname: Kwon
authors.affiliation: Department of Internal Medicine, Pogunhan Mom Hospital, Seoul, Korea.
authors.forename: Kyung-Mook
authors.initials: KM
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
authors.forename: Sang-Heon
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Eulji General Hospital, Eulji University School of Medicine, Seoul, Korea.
authors.forename: Sang-Hoon
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
authors.forename: Jae-Won
authors.initials: JW
authors.lastname: Jeong
authors.affiliation: Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea.
authors.forename: Cheol-Woo
authors.initials: CW
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Sang-Heon
authors.initials: SH
authors.lastname: Cho
authors.affiliation: Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: Byung-Jae
authors.initials: BJ
authors.lastname: Lee
mesh_terms: D000328:Adult; D002908:Chronic Disease; D003371:Cough / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology; D005260:Female; D006785:Hospitals, University; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011788:Quality of Life; D015203:Reproducibility of Results; D056910:Republic of Korea; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D014175:Translating
keywords: Chronic disease; Cough; Korean version of the Cough Symptom Score; Surveys and questionnaires