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Figure 2 ROC Curves Showing the Ability of VE/VCO₂ Slope to Predict Overall Mortality, SCD, and Pump Failure Death

For panel A overall mortality: area under the curve 0.74, p < 0.001, 95% CI 0.61 to 0.81, optimal threshold />37.0, sensitivity 75, specificity 62. For panel B SCD: area under the curve 0.74, p = 0.002, 95% CI 0.61 to 0.81, optimal threshold />39.2, sensitivity 81, specificity 53. For panel C cardiac pump failure: area under the curve 0.69, p = 0.01, 95% CI 0.61 to 0.81, optimal threshold />37.0, sensitivity 72, specificity 65. VE/VCO₂ = ventilation/carbon dioxide production; other abbreviations as in Figure 1.