IFIH1 and dermatomyositis: In the stratified analysis by testing methods, the overall sensitivity, specificity, and AUC values for anti-MDA5 antibody in DM with RPILD versus without RPILD were 0.81 (95% CI: 0.71–0.88), 0.85 (95% CI, 0.78–0.90), and 0.88 (95% CI: 0.85–0.91) with immunoprecipitation, and were 0.86 (95% CI: 0.77–0.92), 0.86 (95% CI, 0.74–0.94), and 0.87 (95% CI: 0.84–0.90) with ELISA.