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a Scatterplot of thresholds for all patients tested on the FST2 (y-axis) plotted against the threshold for the same patient on the D-FST (x-axis). Results from the two tests show good agreement (r = 0.91). b Bland–Altman analysis of thresholds from the same patient on both tests. There is a slight bias, with thresholds on the D-FST being 0.4 log higher than on the FST2. Top and bottom dashed lines mark the 95% confidence range
