Table 2– A comparison of technetium-99m-labelled DTPA clearance between ILD of SSc and IPF patients

	SSc-ILD	IPF	p-value
Subjects n	168	97
DTPA clearance variables
Total clearance min	33.0 (8.8–128.5)	22.7 (7.5–83.2)	<0.00005
Patients with an abnormal clearance	113/168 (67)	84/97 (87)	0.001
Fast clearance min	5.1 (0.8–28.5)^#	5.0 (1.4–32.8)^¶	0.64
%FC	18.3 (1.0–67.0)^#	27.3 (3–100)^¶	<0.0005
Slow clearance min	49.9 (21.4–145.7)^#	48.5 (19.2–137.0)^¶	0.62

Data are presented as median (range) or n/N (%), unless otherwise stated. SSc: systemic sclerosis; ILD: interstitial lung disease; IPF: idiopathic pulmonary fibrosis; DTPA: diethylene triamine pentacetate; %FC: % DTPA cleared by the fast component. ^#: n = 126; ^¶: n = 81.