IFIH1 and interstitial lung disease: The IIM-ILD patients whose age at diagnosis of disease ≥ 59.5 (HR = 2.673, 95% CI 1.588–4.499, p < 0.001), NLR ≥ 6.6109 (HR = 2.004, 95% CI 1.193–3.368, p = 0.009), CAR ≥ 0.2506 (HR = 1.864, 95% CI 1.041–3.339, p = 0.036), ferritin ≥ 397.68 (HR = 2.451, 95% CI 1.245–4.827, p = 0.009) and anti-MDA5 antibody-positive (HR = 1.928, 95% CI 1.123–3.309, p = 0.017) had a higher mortality rate.