Table 1.

PICOS eligibility criteria

PICOS	Inclusion criteria	Exclusion criteria
Population	Studies examining people of all ages with myositis including dermatomyositis, polymyositis, necrotising myositis, juvenile dermatomyositis, inclusion body myositis, mixed connective tissue diseases, overlap myositis, interstitial myositis, orbital myositis and antisynthetase syndrome	–
Intervention/Exposure	Studies examining delayed, incorrect diagnosis, missed diagnosis or slow diagnosis of myositis	–
Comparison	Not applicable	–
OUTCOME	The primary outcome is diagnostic delay. Probable secondary outcomes are causes and consequences of diagnostic delay and patients’ experiences of diagnosis of myositis	–
Study design	All study designs	Review articles
Language	English, German, Indonesian
Setting	No restriction	–
Timing	No restriction	–