Fig. 1From: Borderline pulmonary hypertension is associated with exercise intolerance and increased risk for acute exacerbation in patients with interstitial lung diseaseMean walking distance (m) in the 6MWT (a) and ΔSpO2 (%) defined by initial SpO2 – lowest SpO2 on 6MWT (b) in the 3 groups of ILD patients. Definition of abbreviations: 6MWT, 6-min walking test; SpO2, oxygen saturation as measured by pulse oximeter; PH, pulmonary hypertensionBack to article page