Table 4.

Association of the platform’s QT/QTc intervals with the 12-lead electrocardiogram’s QT/QTc intervals.^a

			12-lead									Lead I									Lead II
			b,c (SE)		P value		b,d (SE)		P value		b,c (SE)			P value		b,d (SE)		P value		b,c (SE)			P value		b,c (SE)		P value
QTce,f			0.30 (0.09)		.002		0.31 (0.09)		.001		0.35 (0.11)			.002		0.30 (0.12)		.01		0.42 (0.14)			.002		0.30 (0.14)		.03
	Age					0.30 (0.22)		.18							0.33 (0.29)		.26							0.04 (0.36)		.92
	Male					–10.66 (6.03)		.08							–10.84 (7.87)		.26							–22.29 (9.41)		.92
	HRg,h					–1.93 (0.52)		<.001							–0.93 (0.43)		.03							–1.62 (0.56)		.006
QTf			0.54 (0.08)		<.001		0.53 (0.08)		<.001		0.44 (0.10)			<.001		0.41 (0.09)		<.001		0.52 (0.11)			<.001		0.48 (0.12)		<.001
	Age					0.37 (0.24)		.13							0.47 (0.26)		.08							0.19 (0.33)		.58
	Male					0.54 (6.02)		.93							2.03 (6.47)		.75							–8.13 (8.11)		.32
	HR					–0.29 (0.53)		.59							1.09 (0.38)		.006							0.54 (0.53)		.31

^aThe QT/QTc intervals from the 12-lead electrocardiogram were modeled using multiple linear regression with QT/QTc intervals from the platform as the main predictor, adjusted for age, sex, and change in HR.

^b: parameter estimates.

^csimple linear regression.

^dmultiple linear regression.

^eQTc: corrected QT.

^fQTc/QT measurements were from the platform.

^gHR: heart rate.

^hChange in HR between the platform and electrocardiogram.