Quality of life assessment in interstitial lung diseases:a comparison of the disease-specific K-BILD with the generic EQ-5D-5L

Table 2 The correlation between health status and lung function

	EQ-5D EBVS	VAS	K-BILD Total	K-BILD Breath	K-BILD Chest	K-BILD Psych	FVC % predicted	DLCO % predicted	Comorbidity sum score
EQ-5D EBVS	1
VAS	0.58 (<.0001)	1
K-BILD Total	0.71 (<.0001)	0.55 (<.0001)	1
K-BILD Breath	0.71 (<.0001)	0.58 (<.0001)	0.86 (<.0001)	1
K-BILD Chest	0.60 (<.0001)	0.47 (<.0001)	0.78 (<.0001)	0.61 (<.0001)	1
K-BILD Psych	0.60 (<.0001)	0.49 (<.0001)	0.93 (<.0001)	0.67 (<.0001)	0.69 (<.0001)	1
FVC % predicted	0.30 (<.0001)	0.21 (0.0013)	0.29 (<.0001)	0.36 (<.0001)	0.22 (0.0006)	0.24 (0.0002)	1
DLCO % predicted	0.17 (0.0106)	0.14 (0.0409)	0.27 (<.0001)	0.35 (<.0001)	0.12 (0.0821)	0.22 (0.001)	0.47 (<.0001)	1
Comorbidity sum score	−0.26 (<.0001)	− 0.25 (0.0002)	− 0.21 (0.0012)	− 0.28 (<.0001)	−0.16 (0.0173)	− 0.16 (0.0174)	− 0.09 (0.1569)	− 0.26 (<.0001)	1

Abbreviations; K-BILD Breath- K-BILD Breathlessness and activity, K-BILD Chest- K-BILD Chest symptoms, K-BILD Psych- K-BILD Psychological Impact, FVC % pred –Forced vital capacity % predicted, DLCO % predicted- Carbon monoxide diffusing capacity % predicted. In brackets we reported p-values. We considered correlations < 0.3 as weak, ≥0.3 and < 0.7 as moderate and ≥ 0.7 as strong