Fig. 2From: Inter-observer agreement of preoperative cardiopulmonary exercise test interpretation in major abdominal surgeryObserved values of the V̇O2VAT (graph A), V̇o2peak (graph B), V̇E/V̇CO2-slope (graph C), and OUES/kg (graph D) in each patient using the guideline-based approach ordered according to increasing value of the mean. Dots represent values determined by individual observers. Each vertical collection of dots represents an individual patient, in which each patient has a unique color throughout all graphs. Horizontal dotted lines represent known risk assessment thresholds defined as 11.1 mL/kg/min for V̇O2VAT [4] (graph A), 18.2 mL/kg/min for V̇O2peak [4] (graph B), and 20.6 for the OUES/kg [14] (graph D). Error bars represent the SD of the mean. Abbreviations: OUES = oxygen uptake efficiency slope; SD = standard deviation; V̇E/V̇CO2-slope = slope of the relationship between the minute ventilation and carbon dioxide production; V̇O2peak = oxygen uptake at peak exercise; V̇O2VAT = oxygen uptake at the ventilatory anaerobic thresholdBack to article page