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Figure 1 Distribution of values for forced vital capacity (FVC) (upper) and gas transfer index or diffusing capacity for carbon monoxide (DL_CO) (lower) in 79 primary pulmonary hypertension (PPH) patients (lines from upper left to lower right) and 20 normal controls (lines from lower left to upper right). Values are divided by deciles of percent predicted (%pred). For these measurements, all individuals below 80% of predicted are below the normal 95% confidence limits. Approximately 50% of the PPH patients have a reduced FVC and 75% have a reduced DL_CO.