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Multivariable adjusted survival curves for death stratified by socioeconomic status (SES) tertiles. (A) Adjusted for age and sex. (B) Adjusted for age, sex, World Health Organization functional classification, and pulmonary vascular resistance. (C) Adjusted for age, sex, World Health Organization functional classification, pulmonary vascular resistance, and use of phosphodiesterase type 5 inhibitors, endothelin receptor antagonists, and prostanoids. Cum = cumulative.
