Table 2.

Reliability Measures for Manually Measured QT Intervals

	Sw	Repeatability	ICC	95% CI
Intraobserver
Overall	9.34	25.87	0.86	0.81–0.91
Measurer 1	8.56	23.72	0.88	0.83–0.92
Measurer 2	8.66	23.99	0.88	0.83–0.92
Measurer 3	9.57	26.52	0.86	0.80–0.91
Interobserver
Single	8.13	22.52	0.88	0.81–0.93
Average of 2	6.60	18.29	0.93	0.87–0.96
Average of 3	6.03	16.69	0.94	0.90–0.96

Sw = within‐subject standard deviation; ICC = intraclass correlation coefficient; CI = confidence interval.