TABLE 3.

Known-groups validity of the King's Brief Interstitial Lung Disease (K-BILD) questionnaire

K-BILD score	Supplemental oxygen use at baseline		Difference	p-value	FVC % pred at 52 weeks		Difference	p-value
	Yes (n=128)	No (n=534)			≤70% (n=350)	>70% (n=186)
Total	49.9±9.5	53.0±10.6	–3.1±10.4	0.0027	50.6±11.6	58.7±12.0	–8.1±11.7	<0.0001
Breathlessness and activities	32.2±15.5	39.5±16.1	–7.3±16.0	<0.0001	35.2±17.4	46.9±18.0	–11.7±17.6	<0.0001
Psychological	50.2±13.8	52.2±15.1	–2.0±14.9	0.15	50.2±16.3	59.2±16.2	–9.0±16.2	<0.0001
Chest symptoms	59.9±19.9	66.0±23.1	–6.1±22.5	0.0061	59.8±22.4	70.7±20.0	–10.9±21.6	<0.0001

Data are presented as mean±sd, unless otherwise stated. FVC: forced vital capacity.