Group

Variables

Demographic features

Age at diagnosis, sex, race, and time to diagnosis

Myositis subgroup

Polymyositis, dermatomyositis, or juvenile dermatomyositis

Medication

Prednisone use, DMARD use, and number of total failed immunosuppressive agents at trial entry

Clinical parameters

Physician’s Global Assessment, Muscle Disease Activity, Extramuscular Global Assessment, Constitutional Disease Activity, Cutaneous Disease Activity, Skeletal Disease Activity, Pulmonary Disease Activity, Patient’s/Parent’s Global Assessment, Manual Muscle Testing (MMT8), HAQ/C-HAQ Disability Index, and Overall Damage Score

Laboratory parameters

Lymphocyte count, ALT levels, AST levels, aldolase levels, CPK levels, total IgM and IgG levels

Autoantibody groups

Antisynthetase, anti-TIF-1γ,anti-SRP, anti-MJ, anti-Mi-2, other autoantibodies, no autoantibodies, or unspecified autoantibodies

Gene Expression/ Cytokines/Chemokines

IFN gene score, IFN chemokine score, IFN-γ, IFN-α, IL-10, IL-12, IL-13, IL-1β, IL-2, IL-4, IL-5, IL-8, IL-6, IL-17, IP-10, TNF-α, MIP-1α, MIP-1β, ITAC, MCP-1, MCP-2, MIG, and TNFR1