Table 3

The relationship between the King's Brief Interstitial Lung Disease (K-BILD) questionnaire and lung function and other health status measures

K-BILD	Lung function			SGRQ				SF36
K-BILD	FEV₁%	FVC%	TLCO%	Sym	Act	Imp	Total	PCS	MCS
Psychological	0.46	0.38	0.45	−0.60	−0.67	−0.80	−0.79	0.57	0.38
Breathlessness and activity	0.55	0.51	0.52	−0.59	−0.84	−0.80	−0.86	0.70	0.33
Chest symptoms	0.48	0.45	0.42	−0.65	−0.64	−0.79	−0.78	0.61	0.36
Total	0.53	0.47	0.50	−0.67	−0.79	−0.87	−0.89	0.68	0.40

Data shown are Pearson's correlation coefficients; all p<0.01.
FEV₁, forced expiratory volume in 1 s; FVC, forced vital capacity; SF36, Short Form 36; SF36 MCS, SF36 Mental Component Summary; SF-36 PCS, SF36 Physical Component Summary; SGRQ, St George's Respiratory Questionnaire; SGRQ Act, SGRQ – Activity; SGRQ Imp, SGRQ – Impact; SGRQ Sym, SGRQ – Symptoms; TLCO, diffusing capacity of the lung for carbon monoxide as % predicted.