Table 2.

Mean values preexposure

	Nonusers	EC Users	TC Smokers	P Value
Supine
Tp-e, ms	106 ± 27	100 ± 42	105 ± 25	0.07
Tp-e/QT	0.28 ± 0.05	0.27 ± 0.11	0.27 ± 0.05	0.09
Tp-e/QTc	0.26 ± 0.05	0.26 ± 0.13	0.26 ± 0.05	0.14
QT, ms	413 ± 31	420 ± 42	428 ± 44	0.41
QTc, ms	431 ± 26	436 ± 30	437 ± 37	0.62
HR, beats/min	64.9 ± 9.1	65.3 ± 12.2	62.3 ± 10.5	0.61
Standing
Tp-e, ms	122 ± 38	103 ± 37	105 ± 23	0.027
Tp-e/QT	0.32 ± 0.06	0.28 ± 0.09	0.27 ± 0.05	0.0029
Tp-e/QTc	0.25 ± 0.06	0.22 ± 0.08	0.22 ± 0.04	0.0046
QT, ms	408 ± 38	399 ± 47	417 ± 54	0.23
QTc, ms	512 ± 45	506 ± 57	516 ± 53	0.66
HR, beats/min	97.5 ± 9.3	98.9 ± 10.9	94.6 ± 12.2	0.27

Values are means ± SD. EC, electronic cigarette; HR, heart rate; TC, tobacco cigarette; T_p-e, T_peak-T_end.