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) |