Patient characteristics and race categories. Percentages are given for those with no missing data for the characteristic. Data in bold type indicate p < 0.05 for comparison to white subjects.
| Characteristics | White, n = 4039 | African American, n = 234 | Asian, n = 78 |
|---|---|---|---|
| Demographic | |||
| Age at disease onset, yrs, mean (median) | 6.4 (5.3) | 8.7 (9.2) | 7.7 (8.2) |
| Disease duration, yrs, mean (median) | 4.9 (3.9) | 4.1 (3.3) | 4.4 (3.7) |
| Female, n (%) | 2943 (73) | 150 (64) | 48 (61) |
| Socioeconomic status, n (%) | |||
| Income (< $50,000/yr) | 330 (10) | 54 (35) | 3 (5) |
| Health insurance (yes) | 3953 (99) | 222 (98) | 76 (97) |
| Disease characteristics | |||
| Oligoarthritis, n (%) | 1708 (43) | 88 (38) | 26 (33) |
| Polyarthritis, n (%) | 2008 (50) | 105 (45) | 37 (47) |
| Systemic, n (%) | 296 (7) | 38 (16) | 15 (19) |
| Rheumatoid factor+, n (%) | 291 (9) | 49 (26) | 7 (11) |
| Physician global assessment mean (median)* | 1.6 (1) | 2.3 (2) | 1.4 (2) |
| ≥ 1 Active joint, n (%) | 1908 (48) | 132 (57) | 31 (39) |
| Treatment, n (%) | |||
| DMARD ever (yes) | 2989 (74) | 175 (76) | 63 (80) |
| Biologic DMARD ever (yes) | 1750 (44) | 128 (55) | 42 (53) |
| Outcomes | |||
| Joint damage on imaging, n (%) | 821 (24) | 73 (36) | 54 (27) |
| Child Health Assessment Questionnaire, mean (median) | 0.35 (0.125) | 0.518 (0.25) | 0.191 (0) |
| Pain score, mean (median)* | 2.6 (2) | 3.1 (3) | 1.4 (0) |
↵* Physician global assessment and pain were measured on a 0–10 numeric rating scale, 10 indicating worst disease or worst pain, respectively. DMARD: disease-modifying antirheumatic drug.