. Author manuscript; available in PMC: 2013 Aug 27.

Published in final edited form as: Respir Med. 2012 Apr 12;106(7):1040–1047. doi: 10.1016/j.rmed.2012.03.006

Table 2.

Subgroup characteristics after stratification on HRCT pattern.

	Age	Female gender	Smoking history	RF positive	Median anti-CCP titer
Isolated airways disease (n =40)	67 (36–85)	28 (70%)	19 (48%)	15 (38%)	44 IU (21–235)
Isolated ILD (n =10)	66 (63–78)	3 (30%)	7 (70%)	2 (20%)	54 IU (22–103)
Airways disease and ILD (n =19)	69 (53–84)	12 (63%)	12 (63%)	3 (16%)	81 IU (21–219)
Combined pulmonary fibrosis with emphysema (n =5)	75 (66–84)	2 (40%)	5 (100%)	2 (40%)	81 IU (24–217)

ILD=interstitial lung disease, HRCT=high resolution computed tomography, RF=rheumatoid factor, and CCP=cyclic citrullinated peptide.