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Figure 3 Correlations and regression equations for gas transfer index (DL_CO) versus three cardiopulmonary exercise test parameters of aerobic function (upper = peak O₂ uptake; middle = anaerobic threshold; lower = peak O₂ pulse) in primary pulmonary hypertension (PPH) patients. Each symbol indicates an individual PPH patient. All values and equations are in units of % predicted (%pred). Dotted lines approximate the 95% confidence limits of controls.