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Graph showing the level of desaturation at the end of the 6MWT at the end-of-study visit. Only two patients did not receive same level of supplemental oxygen at end of the study visit compared with the initial visit. Both were receiving placebo, and their values are indicated as circles, rather than the triangles used for all others. No significant difference was found in the desaturation between the riociguat and placebo groups. 6MWT = 6-min walk test.
