Table 1. Baseline characteristics of patients with chronic cough.

Characteristics		Total (n = 478)	Unexplained chronic cough (n = 62)	Chronic cough (n = 416)	P value*
Age (years)		55.1 ± 15.7	59.8 ± 13.0	54.4 ± 16.0	0.012
Female sex (%)		68.4	85.5	65.9	0.002
Smoking status (%)					0.066
	Never smoker	74.7	85.5	73.0
	Ex-smoker	17.7	12.9	18.4
	Current smoker	7.7	1.6	8.6
Cough duration (%)					< 0.001
	2–6 months	44.0	0.0	50.6
	6–12 months	13.8	6.5	15.0
	1–5 years	21.6	43.6	18.3
	> 5 years	20.6	50.0	16.1
Total LCQ score			10.7 ± 2.9
	Physical		4.1 ± 0.9
	Psychological		3.3 ± 1.1
	Social		3.3 ± 1.4
Cough VAS			6.1 ± 2.0

Results are expressed as mean ± standard deviation or percentage.

VAS, visual analogue scale; LCQ, Leicester Cough Questionnaire; SD, standard deviation.

^*Difference between unexplained chronic cough and chronic cough groups.