Abstract P210

	Never smokers (n = 63)		Non-index (n = 42)
	Regression method	Age group method	Regression method	Age group method
FEV1 % predicted using 80% threshold	38	25–29	41	40–44
FEV1:FVC	45	55–59	47	40–44
KCO % predicted using 80% threshold	33	30–34	24	25–29
Upper zone voxel index	<20	25–29	20	25–29
Lower zone voxel index	25	30–34	27	30–34