Table 2 Disease activity and damage: IMACS core set measurements

Disease activity

 Physician global activity—VAS/Likert

 Patient/parent global activity—VAS/Likert

 Muscle strength—manual muscle test (MMT)

 Physical function—[C]HAQ, CMAS

 Laboratory—muscle enzymes

 Extra-muscular activity—MDAAT

Damage

 Myositis Damage Index (MDI)

 Physician global damage—VAS/Likert

 Physical function—[C]HAQ