Demographic characteristics of study cohort (n = 1000). Values are % (n) unless otherwise specified.
| Characteristics | African American, n = 228 | White, n = 555 | Hispanic, n = 196 | Other, n = 21 | p |
|---|---|---|---|---|---|
| Age at disease onset, yrs, mean ± SD | 40.6 ± 13.01 | 44.4 ± 14.11,4 | 40.2 ± 14.04 | 40.9 ± 13.6 | 0.0002 |
| Disease duration, yrs, mean ± SD | 6.6 ± 6.22 | 9.2 ± 9.02,4 | 6.7 ± 6.94 | 6.6 ± 5.6 | < 0.0001 |
| Female, n = 828 | 84.7 (193) | 83.1 (461) | 85.7 (168) | 76.2 (16) | NS |
| Male, n = 162 | 15.3 (35) | 16.9 (94) | 14.3 (28) | 23.8 (5) | NS |
| dcSSc, n = 483 | 66.2 (151)3 | 38.0 (211)3,5 | 57.2 (112)5 | 42.9 (9) | < 0.0001 |
| lcSSc, n = 507 | 32.0 (73)3 | 61.4 (341)3,5 | 41.3 (81)5 | 57.1 (12) | < 0.0001 |
| Unspecified, n = 10 | 1.8 (4) | 0.5 (3) | 1.5 (3) | 0.0 (0) | NS |
African American versus white:
↵1 p < 0.01 (age at disease onset),
↵2 p < 0.05 (disease duration), and
↵3 p < 0.0001 (diffuse, limited). African American versus Hispanic: NS for all categories. White versus Hispanic:
↵4 p < 0.01 (age at disease onset, disease duration) and
↵5 p < 0.0001 (diffuse, limited). SSc: systemic sclerosis; dcSSc: diffuse cutaneous SSc; lcSSc: limited cutaneous SSc; NS: not significant.