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Figure 4: The Receiver Operating Characteristic curve. Sensitivity (y-axis) plotted against 1 - specificity (x-axis), demonstrating the predictive value of the cut-off score of the Epworth sleepiness scale. An Epworth Sleepiness Scale score of 10 had an area under the curve of 0.84, which means that the probability that Visual Analog Scale predicted sleepiness correctly was 84% when a cut-off Epworth Sleepiness Scale score of 10 was used

Figure 4: The Receiver Operating Characteristic curve. Sensitivity (y-axis) plotted against 1 - specificity (x-axis), demonstrating the predictive value of the cut-off score of the Epworth sleepiness scale. An Epworth Sleepiness Scale score of 10 had an area under the curve of 0.84, which means that the probability that Visual Analog Scale predicted sleepiness correctly was 84% when a cut-off Epworth Sleepiness Scale score of 10 was used