Table 4. Diagnosis at the optimal cutoff points of the QRS amplitude and Tslew.

Index (%)	% (95% CI)
	Se	Sp	PV+	PV–	Coincidence rate
QRS ≤72.3	68.42 (43.45, 87.42)	90.91 (58.72, 99.77)	92.86 (66.13, 99.82)	62.50 (35.43, 84.80)	76.67 (57.72, 90.07)
Tslew ≤90	94.74 (73.97, 99.87)	81.82 (48.22,97.72)	90.00 (68.30, 98.77)	90.00 (55.50, 99.75)	90.00 (73.47, 97.89)

QRS, QRS amplitude; Tslew, the maximum slope of the descending T wave of ventricular evoked response (VER); Se, sensitivity; Sp, specificity; PV+, positive predictive values; PV–, negative predictive values; CI, confidence interval.