Figure 1From: Poor sleep quality is associated with exercise limitation in precapillary pulmonary hypertensionRelation of sleep quality to exercise performance (a) NYHA functional class and (b) six-minute walk distance. For abbreviations see Tables 1 and 2. *p < 0.05 in comparison to patients with a PSQI score ≤ 5. **p < 0.01 in comparison to patients with a PSQI score ≤ 5.Back to article page