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. Author manuscript; available in PMC: 2024 Feb 1.
Published in final edited form as: Semin Arthritis Rheum. 2022 Nov 3;58:152111. doi: 10.1016/j.semarthrit.2022.152111

Table 1.

Definitions and Selected Instruments for the OMERACT Myositis Working Group Core Domains of Interest.

OMERACT DOMAIN Definition Selected Instrument
Physical Function The ability to perform basic and desired activities of daily living that is affected by decreased use of muscles or other organ systems affected by IIM. PROMIS Physical Function 8b v2.0
Pain Interference Aching, soreness, or tenderness attributable to IIM relating to the joints, muscles, and/or skin causing interference with routine daily function. PROMIS Pain Interference 6a v1.0
Fatigue A feeling of [extreme] tiredness or exhaustion attributable to IIM, interfering with usual and meaningful daily activities. PROMIS Fatigue 7a v1.0