TRIM33 and dermatomyositis: In ordered logistic regression analysis using control data from the IIM Immunochip study (n = 9911), HLA alleles associated with the DM-specific autoantibodies anti-Mi-2 and anti-TIF1-γ were strongly negatively associated with latitude (OR 0.97, 95% CI 0.96–0.98, P < 0.001; and OR 0.98, 95% CI 0.97–0.99, P < 0.001, respectively).