Table 1. Evidence summary of cough in chronic respiratory disease.

Cough characteristics	Asthma	COPD	Bronchiectasis	ILD	Sarcoidosis
Prevalence of cough	8–58%	10–74%	82–98%	50–89%	3–64%
Impact of cough	↑ GINA severity	↑ SGRQ/CAT	↑ BSI	↑ Mortality†	↓ FVC#
	↑ ACQ	↓ FEV1	↑ CT severity	↑ CT severity	↓ ACE#
	↓ FEV1	↑ Exacerbations#	↑ Exacerbations	↓ FVC	↑ Dyspnoea
	↑ Exacerbations	↑ Dyspnoea	↑ Sputum burden	↓ DLCO
	↑ Dyspnoea			↑ Dyspnoea
Impaired QoL, LCQ range	13–18	13–19	12–16	15–17	15–17
Cough reflex sensitivity	↑	↑	↑	↑	↑

↑, increased; ↓, decreased; ^†, data conflicting. COPD, chronic obstructive pulmonary disease; ILD, interstitial lung disease; GINA, Global Initiative for Asthma; SGRQ, St George’s Respiratory Questionnaire; CAT, COPD Assessment Tool; BSI, Bronchiectasis Severity Index; FVC, forced vital capacity; ACQ, Asthma Control Questionnaire; FEV₁, forced expiratory volume in 1 second; CT, computed tomography; ACE, angiotensin converting enzyme; DLCO, diffusing capacity of the lungs for carbon monoxide; QoL, Quality of Life; LCQ, Leicester Cough Questionnaire (range, 3–21, lower score indicates worse cough-specific health status).