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Figure 2 Mean change in Borg dyspnea score from baseline to months 3, 6, 9, and 12 in the placebo and beraprost sodium (BPS) groups; p = 0.24 at 3 months; p = 0.27 at 6 months; p = 0.92 at 9 months; and p = 0.75 at 12 months (analysis of covariance adjusted for center, etiology, and baseline peak oxygen consumption, 6-min walk distance, Borg dyspnea score, and vasodilator use). Black bars = BPS; white bars = placebo. Number in the bars = exact mean rates; lines = standard error of the mean.