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The validity and reliability of the Turkish version of the Leicester Cough Questionnaire 
in COPD patients

Background/aim
The reliability and validity of the Turkish version of the Leicester Cough Questionnaire (LCQ) have been evaluated 
before. This study aimed to validate the Turkish version of the LCQ in chronic obstructive pulmonary disease (COPD) patients with 
cough.


Materials and methods
COPD (GOLD B, C, D) patients over age 40 (n = 75) and healthy volunteers as a control group (n = 75) were 
included. A sociodemographic data form, the LCQ, the Short Form-36 (SF-36) quality of life questionnaire, and the World Health 
Organization Quality of Life Brief Form for Turkish people were completed. The internal reliability of the LCQ was determined using 
the Cronbach alpha coefficient (>0.6) and its repeatability by the intraclass consistency coefficient (P < 0.05) was accepted as significant.


Results
For internal consistency, Cronbach alpha coefficients of all subscales of the LCQ, physical, psychological, and social, were found 
as 0.72, 0.86, and 0.83, respectively, with 0.92 for the total index. There was significant internal consistency for all subscales and the total 
index (Cronbach alpha coefficients of >0.6). In test–retest reliability, the correlation coefficient ranged between 0.71 and 0.80 for each 
question and was calculated as r = 0.89 for total LCQ score (P < 0.001).


Conclusion
The Turkish version of the LCQ has been found to have acceptable reliability and validity for use in Turkish COPD patients 
with chronic cough.