Among ILD patients, the variables significantly associated with PH were BMI (P = 0.02), serum uric acid (P = 0.004), NT-proBNP (P = 0.03), shorter 6MWT distance (P = 0.004), TLC (P = 0.04), RV (P = 0.03), DLCO (P = 0.001), PAWP (P < 0.001), and PVR (P < 0.001) (Table 3). This evidence concerns the gene NPPB and interstitial lung disease.