Table 1

Baseline characteristics and Pearson's correlation coefficients with EQ-5D-5L utility index and EQ-VAS (n=616)

Characteristic	Mean (SD)	Pearson's correlation coefficient with EQ-5D-5L
		Utility index		EQ-VAS
		r	p Value	r	p Value
Age (years)	70.4 (9.3)	0.138	<0.001	0.039	0.330
Male (%)	59.7
Smoking pack years	43.4 (34.8)	−0.123	0.003	−0.163	<0.001
BMI (kg/m²)	27.5 (6.8)	−0.132	0.001	−0.104	0.010
FEV₁ (% predicted)	46.1 (19.6)	0.156	0.002	0.112	0.006
MRC	3.4 (1.0)	−0.490	<0.001	−0.376	<0.001
SGRQ symptoms	67.5 (26.4)	−0.257	<0.001	−0.283	<0.001
SGRQ activities	69.2 (21.2)	−0.603	<0.001	−0.409	<0.001
SGRQ impact	36.1 (19.9)	−0.596	<0.001	−0.457	<0.001
SGRQ total	51.1 (18.2)	−0.623	<0.001	−0.469	<0.001
CRQ dyspnoea	13.7 (5.4)	0.403	<0.001	0.346	<0.001
CRQ fatigue	13.8 (5.3)	0.572	<0.001	0.500	<0.001
CRQ emotion	30.4 (9.6)	0.593	<0.001	0.468	<0.001
CRQ mastery	17.4 (5.8)	0.578	<0.001	0.426	<0.001
CRQ total	75.2 (21.9)	0.704	<0.001	0.518	<0.001
CAT	20.7 (8.2)	−0.528	<0.001	−0.428	<0.001
CCQ symptoms	2.8 (1.3)	−0.483	<0.001	−0.406	<0.001
CCQ function	2.8 (1.5)	−0.674	<0.001	−0.459	<0.001
CCQ mental	2.9 (1.8)	−0.507	<0.001	−0.382	<0.001
CCQ total	2.9 (1.3)	−0.626	<0.001	−0.483	<0.001
Utility index	0.68 (0.24)			0.538	<0.001
EQ-VAS	61.0 (20.6)	0.538	<0.001

Data expressed as mean (SD) or Pearson's r.
BMI, body mass index; CAT, COPD assessment test; CCQ, clinical COPD questionnaire; CRQ, chronic respiratory questionnaire; MRC, Medical Research Council Dyspnoea Score; SGRQ, St George's respiratory questionnaire.