ECG parameters

HbAA

HbAS

HbSS

p-value

Heart rate (beats/min)

67.6 ± 9.1

66.6 ± 9.3

73.5 ± 10.1

0.016*

QRS Axis (˚)

49.6 ± 18.4

53.5 ± 14.9

39.5 ± 22.4

0.017*

PR Interval(s)

0.19 ± 0.03

0.19 ± 0.04

0.20 ± 0.03

0.532

Tp-e Interval (ms)

80.0 ± 15

77.3 ± 14

83.0 ± 15

0.362

QTc

0.38 ± 0.03

0.37 ± 0.05

0.39 ± 0.08

0.764

Tp-e/QTc

0.211 ± 0.05

0.215 ± 0.05

0.230 ± 0.06

0.518

SV1 + RV5 (mm)

33.5 ± 12

26.8 ± 10

34.9 ± 11

0.018*