Table 3

Correlations between objective and subjective measures of cough in patients with chronic cough

	Log total time spent coughing	Log daytime spent coughing	Log night-time spent coughing
LCQ, Leicester Cough Questionnaire; log C5, logarithmic transformation of concentration causing 5 coughs; NA, not applicable; VAS, Visual Analogue Scale.
*Non-parametric correlations.
Cough score
Day	NA	r = 0.50	NA
		p⩽0.001
Night	NA	NA	r = 0.55
			p⩽0.001*
VAS
Day	NA	r = 0.46	NA
		p⩽0.001
Night	NA	NA	r = 0.61*
			p⩽0.001

Log₁₀ C5
Day	NA	r = −0.45	NA
		p⩽0.001

LCQ
Total	r = −0.62	r = −0.54	r = −0.39
	p⩽0.001	p⩽0.001	p = 0.002
Physical	r = −0.55	r = −0.43	r = −0.53
	p⩽0.001	p = 0.001	p⩽0.001
Psychological	r = −0.59	r = −0.54	r = −0.33
	p⩽0.001	P⩽0.001	p = 0.012
Social	r = −0.55	r = −0.49	r = −0.26
	p⩽0.001	p⩽0.001	p = 0.053