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Effect of PH subtype on risk of death. In a multivariable model, male gender, increasing age at PH diagnosis, and PH due to lung disease, heart disease or multiple causes are each associated with increasing risk of death. Open diamonds indicate reference categories. PH: pulmonary hypertension; PAH: pulmonary arterial hypertension; CTEPH: chronic thromboembolic pulmonary hypertension; CI: confidence interval.
