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Figure 2 Clinical outcome after cardiopulmonary exercise testing, displaying Kaplan-Meier curves according to the achieved functional capacity classified as normal (solid line) or reduced (dotted line) based on achieving above or below 84% of the expected VO₂ for age, gender, and presence of excess weight. The end point measured is the incidence of either clinical events (death, heart failure, or new atrial arrhythmia) or the indication of mitral surgery. Note the significant excess event rate in patients with reduced functional capacity. The numbers associated with each line represent the three-year rate of event for each group.