Table 4 Electrocardiographic (ECG) parameters among the three study groups (N = 105)

P wave amplitude (mv)

0.251 ± 0.001

0.249 ± 0.004

0.25 ± 0.003

0.37^$

0.9^#

1

P wave duration (ms)

114.6 ± 7.8

111.4 ± 12.16

108 ± 15.1

0.08^$

0.223^#

2.6

P-R interval (ms)

126 ± 8.1

126.57 ± 8.7

127.71 ± 9.1

0.702^$

0.279^#

0.35

QRS complex(ms)

88.86 ± 9.3

87.7 ± 9.4

100.57 ± 6.8

 < 0.001^{* $}

0.580^#

23.9

QT interval

360 ± 17.6

361.22 ± 14.2

343.7 ± 24.3

 < 0.001^{* $}

0.783^#

22.751

QTc interval(ms)

390.9 ± 13.16

394.86 ± 16.19

385 ± 13.16

 < 0.001^{* $}

0.633^#

51.4

Tpe interval (ms)

83.2 ± 6.6

85.5 ± 4.3

78.86 ± 5.2

 < 0.001^{* $}

0.85^#

188.7

TPe/QT ratio

0.23 ± 0.01

0.25 ± 0.02

0.2 ± 0.03

 < 0.001^{* $}

0.79^#

250.9

TPe/QTc ratio

0.21 ± 0.02

0.23 ± 0.03

0.19 ± 0.02

 < 0.001^{* $}

0.76^#

964.5