Demographic features of patients with SLE and history of myositis versus no myositis
| Demographics | With myositis (n=179) | Without myositis (n=2258) | P value |
| Gender, n (%) | NS | ||
| Female | 171 (95.5) | 2083 (92.3) | |
| Male | 8 (4.5) | 175 (7.8) | |
| Race, n (%) | <0.0001 | ||
| African American | 112 (62.6) | 837 (37.2) | |
| Caucasian | 57 (31.8) | 1249 (55.4) | |
| Other | 10 (5.6) | 170 (7.5) | |
| Years of education | 13.7±2.9 | 14.4±3.1 | 0.0029 |
| Private insurance, n (%) | <0.0001 | ||
| Yes | 116 (65.5) | 1718 (79.3) | |
| No | 61 (34.5) | 448 (20.7) | |
| Family history of SLE, n (%) | |||
| Yes | 52 (29.2) | 599 (26.6) | NS |
| No | 126 (70.8) | 1651 (73.4) | |
| History of smoking, n (%) | NS | ||
| Yes | 61 (34.1) | 824 (36.6) | |
| No | 118 (65.9) | 1428 (63.4) |