. Author manuscript; available in PMC: 2010 Oct 1.

Published in final edited form as: J Rheumatol. 2009 Sep 1;36(10):2250–2256. doi: 10.3899/jrheum.090340

Table 2.

Demographic features of the study subjects.

Characteristic	SSc/PBC Overlap, n = 16	SSc Alone, n = 801	All Subjects, n = 817
Mean age at enrollment (SD), yrs	62.7 (7.81)	53.77 (13.12)	53.95 (13.1)^*
Mean disease duration (SD), yrs	16.21 (9.49)	9.02 (7.85)	9.16 (7.94)^†
N female/N male	16/0	709/92	725/92
Race (%)
Caucasian	15 (94)	632 (79)	647 (79)
African American	0	75 (9)	75 (9)
Hispanic	1 (6)	67 (8)	68 (8)
Other	0	27 (3)	27 (3)
Limited SSc (%)	13 (81)	474 (59)	487 (60)
Diffuse SSc (%)	3 (19)	323 (40)	326 (40)

p = 0.007.

^†

p = 0.002. SSc: systemic sclerosis; PBC: primary biliary cirrhosis.