The prevalence of<unk>  is higher than that of dermatomyositis and lower than that of SLE. In a 2011 Norwegian study, the prevalence of<unk>  was 3.8 per 100,000 adults, with an incidence of 2.1 per million per year.<unk>  is much more frequent in women than in men at between a 3:1 to 16:1 ratio, and in women younger than 50. The general age at onset is around 15–25 years old.
Mixed connective tissue disease
Carnitine palmitoyltransferase II
Undifferentiated connective tissue disease
Scleroderma
Systemic scleroderma
Antisynthetase syndrome
CREST syndrome
Cryopyrin-associated periodic syndrome