Table 3.

Correlations between responses to different drugs

Drug A vs. Drug B by ECG measure (all subjects)	r [95% CI]	P	N	r2
QTc
Dofetilide vs. Quinidine	0.53 [0.13 to 0.78]	0.01	21	0.28
Dofetilide vs. Ranolazine	0.49 [0.09 to 0.76]	0.02	22	0.24
Quinidine vs. Ranolazine	0.53 [0.13 to 0.78]	0.01	21	0.29
J-Tpeakc
Dofetilide vs. Quinidine	0.46 [0.03 to 0.74]	0.04	21	0.21
Dofetilide vs. Ranolazine	0.54 [0.15 to 0.78]	0.009	22	0.29
Quinidine vs. Ranolazine	0.51 [0.11 to 0.77]	0.02	21	0.26
Tpeak-Tend
Dofetilide vs. Quinidine	0.72 [0.41 to 0.88]	<0.001	21	0.52
Dofetilide vs. Ranolazine	0.44 [0.03 to 0.73]	0.04	22	0.20
Quinidine vs. Ranolazine	0.57 [0.19 to 0.80]	0.007	21	0.33

Drug A vs. Drug B correlations computed comparing the slopes of each measure.