The results of the statistical power calculation showed the sample size of the meta-analysis for DM with ILD versus that without ILD had more than 99% power (α = 0.05) when the positive rates of anti-MDA5 antibody for DM with ILD and DM without ILD were defined as 40.53% and 4.13%, respectively (Supplementary Figure 14). This evidence concerns the gene IFIH1 and dermatomyositis.