Table 2.

Short-term (5-minute) ECG derived data in the two study groups.

Variables	VT group N: 27	No-VT N: 97	P values
QTe mean, ms	391 ± 56	381 ± 73	Ns
QTe variance, ms2	46 [59]	43 [49]	Ns
QTp mean, ms	293 ± 52	304 ± 48	Ns
QTp variance, ms2	47 [54]	35 [52]	Ns
T e mean, ms	91 ± 39	88 ± 25	Ns
T e variance, ms	99 [76]	86 [93]	Ns
RR mean, ms	961 ± 142	966 ± 137	ns
RR variance, ms2	707 [879]	729 [962]	ns
QTe variability index	−0.46 [1.17]	−0.35 [0.80]	ns
QTp variability index	−0.21 [1.22]	−0.16 [0.84]	ns
T e variability index	1.17 0 [1.26]	1.28 [0.79]	ns

Values are expressed as mean ± SD (compared with unpaired t-test) or median [interquartile range 75th percentile–25th percentile] (Mann-Whitney U test).