Leicester Cough Questionnaire

Leicester Cough Questionnaire (LCQ) is a self-reporting quality of life measure of chronic cough, developed by S.S. Birring. It consists of 19 items with a 7 point Likert response scale. It generally takes about 5 minutes to be completed. Since the first development in 2003 LCQ has been translated and validated in several languages (Dutch, French, Korean, Lithuanian, Mandarin Chinese, Polish, Portuguese, Spanish, Swedish, Thai). LCQ has been used as an outcome measure for different respiratory diseases.

Clinimetric properties of LCQ

Concurrent Validity	English Vers.	Dutch Vers.	Mandarin Vers.	Korean Vers.	French Vers.	Thai Vers.	Spanish Vers.	Swedish Vers.	Polish Vers.	Lithuanian Vers.
Cough VAS	-0.72			-0.58					-0.39	0.40
SGRQ - total	-0.56		-0.60				-0.66	-0.55	-0.49
SF36 – total	0.46	0.41		0.55		0.33
Borg Cough Scale		-0.41				-0.74
HADS - total		-0.46	-0.36						n.s.
Cough symptom score				-0.66
CASA-Q					0.58-0.81
CAT								-0.69
EQ5D									-0.59

SGRQ: Saint George respiratory Questionnaire; VAS: Visual Analogue Scale; SF-36: Short Form-36; HADS: Hospital Anxiety and Depression Scale; CASA-Q: Cough and Sputum Assessment Questionnaire; CAT: COPD Assessment Test; EQ5D: EuroQol five-dimensional Questionnaire.

All data are expressed as r-correlation coefficient between total scores of each instruments listed and are all statistically significant unless specified.

Repeatability	Intraclass Correlation Coefficient
English Version	0.96
Dutch Version	0.93
Mandarin Chinese Version	0.89
Korean Version	0.75
French Version	0.85
Thai Version	0.91
Spanish Version	0.84
Swedish version	0.96
Polish Version	0.99
Lithuanian Version	0.89

Internal consistency and Reliability	Cronbach’s alpha coefficient
English Version	0.92
Dutch Version	0.93
Mandarin Chinese Version	0.93
Korean Version	0.94
French Version	0.92
Thai Version	0.92
Spanish Version	0.91
Swedish version	0.97
Polish Version	0.89
Lithuanian Version	0.93