Fig. 2
From: Prognostic value of cardiopulmonary exercise testing in patients with systemic sclerosis
Survival and CPET parameters, Kaplan–Meier analysis (a-c), receiver operation characteristic. d. a peakVO2 in mL∙kg-1∙min-1. b peakVO2 as % of predicted normal value. c VE/VCO2-slope. d Receiver operation characteristic for selected parameters. FVC: forced vital capacity in % predicted (area under curve [AUC]=0.73; best cut-off [cut]=80%, Youden Index [Y]=0.30); KCO: Krogh factor (DLCO per alveolar volume in % predicted; AUC= 0.80, cut=62%, Y=0.54); peakVO2: peak oxygen uptake in mL∙kg-1∙min-1 (AUC=0.8, cut=15.6, Y=0.59); VE/VCO2-slope: slope of the relationship between ventilation and carbon dioxide output (AUC=0.8, cut=35, Y=0.57)