Figure 2From: Epidemiology and long-term survival of pulmonary arterial hypertension in the Czech Republic: a retrospective analysis of a nationwide registry Factors associated with survival in the incident population. A) All patients (n = 91); B) Patients with idiopathic or heritable PAH (n = 53). Footnote: Optimal cut-off levels for parameters included in the Cox proportional hazard methods were identified using time-dependent receiver operating characteristic analysis [16]. The selection of variables for the multivariate model was based on univariate statistical significance <0.1 followed by redundancy analysis and a forward stepwise algorithm.Back to article page