Table 2. Comparison of ventricular depolarization and repolarization findings according to study groups.

Variable	group I n=30	group II n=30	group III n=30	group IV n=30	p
QT interval, time (ms)	367 ± 49	380 ± 21	381 ± 24	382 ± 51	0.338
QTc interval, time (ms)	405 ± 23	406 ± 34 β,Δ	406 ± 15	407 ± 16	0.989
Tpe interval, time (ms)	70.3 ± 7.1α	72.7 ± 7.7β	74.1 ± 8.5⁑	90.1 ± 9.2	<0.001
Tpe/QT ratio	0.186 ± 0.021α	0.191 ± 0.023β	0.203 ± 0.051⁑	0.235 ± 0.034	<0.001
Tpe/QTc ratio	0.188 ± 0.022α	0.186 ± 0.024β	0.200 ± 0.018⁑	0.216 ± 0.029	<0.001

Values are shown as mean ± standard deviation or n (%). Group I: Healthy controls, group II: patients with COVID-19 without pneumonia, group III: patients with COVID-19 and mild pneumonia, group IV: patients with COVID-19 and severe pneumonia.

^α= significant difference between group I and group IV (p < 0.05).

^¥= significant difference between group I and group III (p < 0.05).

^▶= significant difference between group I and group II p<0.05).

^β= significant difference between group II and group IV (p < 0.05).

^Δ= significant difference between group II and group III (p < 0.05).

^⁑= significant difference between group III and group IV p<0.05).