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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: J Electrocardiol. 2014 Jan 6;47(3):288–293. doi: 10.1016/j.jelectrocard.2014.01.004

Table 3.

Intraclass correlation coefficients (95% confidence interval) of ECG measures in selected leads for inter- and intrarater assessment.

Interrater assessment* Intrarater assessment†
P wave duration (II) 0.46 (0.35, 0.57) 0.57 (0.42, 0.71)
P wave amplitude (II) 0.85 (0.81, 0.89) 0.97 (0.96, 0.98)
PR interval (II) 0.81 (0.75, 0.85) 0.97 (0.95, 0.98)
QT interval (V5) 0.81 (0.75, 0.85) 0.94 (0.92, 0.96)
QRS duration (V6) 0.83 (0.79, 0.87) 0.96 (0.95, 0.98)
R wave amplitude (V6) 0.98 (0.97, 0.99) 0.98 (0.96, 0.98)
*

Interrater assessment evaluated intraclass correlation coefficients using values obtained from automated measures and digital calipers.

†

Intrarater assessment evaluated intraclass correlation coefficients using values obtained from digital calipers only.