Table 3.

Comparison of existing and proposed classification criteria for ASyS and IIM, adapted from Opinc, 2021 [3] and Marco, 2020 [36].

Solomon et al., 2011 [30]	Connors et al., 2010 [35]	EULAR/ACR 2017 [34]
Antisynthetase antibody plus two major criteria or one major and two minor criteria:	Antisynthetase antibody plus one or more of the following:	Definite IIM: score of at least 7.5 (8.7 with muscle biopsy) Probable IIM: score of at least 5.5 (6.7 with muscle biopsy)
Major Criteria Myositis by Bohan and Peter [33] ILD Minor Criteria Arthritis Raynaud’s phenomenon Mechanic’s hands	Myositis by Bohan and Peter [33] ILD Arthritis Raynaud’s phenomenon Mechanic’s hands Persistent unexplained fever	Anti-Jo-1 Objective symmetrical weakness of upper and lower proximal extremities Proximal leg muscles weaker than distal Dysphagia or esophageal motility disorders Skin lesions (heliotrope rash, Gottron’s papules, and Gottron’s sign) Age of onset Typical features in muscle biopsy and elevated skeletal muscle enzymes