2.6 Logistic regression analysis
Binary logistic regression was used to estimate odds ratios (ORs) for death from any cause in the PAH patients treated with each pulmonary vasodilator or supportive therapy. Based on the results of ORs, the variables that may be associated with death from any cause in the PAH patients were confirmed by adjusted ORs calculated from multivariate analysis. The final multivariate model selection was based on the Akaike information criterion (AIC) and receiver operating characteristic (ROC) analysis.