Dividing the patients into two groups according to the median %FEV1.0 (83.6%) as in Table 4, a univariate logistic regression analysis showed that higher BW, higher BNP, higher mPAP, higher PVR, lower CI, higher RAP, higher CTA obstruction score were associated with a low %FEV1.0 in CTEPH patients. The gene discussed is NPPB; the disease is chronic thromboembolic pulmonary hypertension.