| DM | dermatomyositis |
| PM | polymyositis |
| ANA | antinuclear antibody; |
| Anti-SSA | anti-Sjögren’s syndrome-related antigen A |
| Anti-SSB | anti-Sjögren’s syndrome-related antigen B |
| Anti-RNP | anti-ribonucleoprotein |
| BMI | body mass index |
| CK | creatine kinase |
| SLE | systemic lupus erythematosus |
| SES | socioeconomic status |
| RA | rheumatoid arthritis |
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