CD8A and interstitial lung disease: Age, with a cut-off value of 62 years (0.80 sensitivity, 0.47 specificity, AUC 0.67); BALF NLR, with a cut-off value of 8.696 (0.62 sensitivity, 0.72 specificity, AUC 0.62); BALF Neu%, with a cut-off value of 3.0% (0.57 sensitivity, 0.63 specificity, AUC 0.59); BALF Lym%, with a cut-off value of 42.0% (0.77 sensitivity, 0.53 specificity, AUC 0.63); BALF Eos%, with a cut-off value of 0.5% (0.49 sensitivity, 0.70 specificity, AUC 0.60); and BALF CD8, with a value of 34.2 (0.74 sensitivity, 0.62 specificity, AUC 0.66), were identified as diagnostic predictors for PF-ILD.