Table 3.

Prediction of Subtype (LQTS1 vs LQTS2)

Variable
	Male patients (N=78)						Female patients (N=111)						P value
AUC	Cutoff, ms	Specificity	Sensitivity	PPV	NPV	AUC	Cutoff, ms	Specificity	Sensitivity	PPV	NPV
Peak exercise QTc	0.71	435	0.53	0.80	0.46	0.74	0.72	460	0.63	0.76	0.65	0.80	0.82
1‐Min recovery QTc	0.70	435	0.44	0.76	0.80	0.39	0.82	455	0.91	0.75	0.95	0.49	0.15

Total N=189. Modeling adjusted for familial relatedness, and P values corrected for multiple comparisons. AUC indicates area under the curve; LQTS, long‐QT syndrome; NPV, negative predictive value; PPV, positive predictive value; and QTc, corrected QT interval.