Table 3.

Reproducibility agreement of GEH measurements on two 10-sec ECGs on perfectly N median beat.

	Measurement	ECG1 mean(SD)	ECG2 mean(SD)	Bias	95% Limits of agreement	% bias	Precision, %	CV, %	ICC	Lin ρc (95%CI)	Pearson r	Bradley-Blackwood F(P)
100% N median beat (n=3,953)	Heart rate, bpm	61.5(9.4)	61.7(9.4)	−0.23	−5.5 to 5.0	0.34	99.66	4.3	0.979	0.958(0.956–0.961)	0.959	15.0(<0.0001)
	Peak QRS-Tangle,°	43.7(36.0)	43.8(36.2)	−0.05	−21.1 to 21.0	0.08	99.92	24.2	0.977	0.956(0.953–0.958)	0.956	1.26(0.285)
	Area QRS-Tangle,°	63.9(34.5)	64.0(34.7)	−0.10	−14.6 to 14.4	0.15	99.85	11.4	0.989	0.977(0.976–0.979)	0.977	2.09(0.124)
	Peak SVG azimuth,°	−1.4(26.9)	−1.3(26.7)	−0.13	−18.5 to 18.3	0.08	99.92	5.2	0.968	0.939(0.935–0.942)	0.939	0.91(0.403)
	Area SVG azimuth,°	−17.5(25.7)	−17.0(25.8)	−0.53	−21.4 to 20.4	0.38	99.62	6.4	0.955	0.914(0.909–0.919)	0.914	5.26(0.005)
	Peak SVG elevation,°	71.0(14.4)	71.0(14.1)	−0.04	−6.8 to 6.8	0.07	99.93	4.9	0.985	0.970(0.968–0.972)	0.971	16.6(<0.0001)
	Area SVG ,elevation,°	69.5(15.3)	69.6(15.2)	−0.08	−9.8 to 9.6	0.14	99.86	7.1	0.973	0.947(0.944–0.951)	0.947	1.57(0.209)
	Peak SVGmag,mV	1.57(0.45)	1.56(0.45)	0.001	−0.21 to 0.21	0.06	99.94	6.8	0.985	0.971(0.969–0.973)	0.971	0.08(0.926)
	SVG,mV*ms	67.0(27.1)	66.9(27.0)	0.15	−11.4 to 11.7	0.27	99.73	8.8	0.988	0.976(0.975–0.978)	0.976	1.79(0.167)
	VMQTi, mV*ms	96.8(30.5)	96.7(30.3)	0.10	−8.87 to 9.08	0.13	99.87	4.7	0.994	0.989(0.988–0.989)	0.989	4.10(0.017)
	SAIQRST, mV*ms	146.7(46.6)	146.5(46.3)	0.251	−14.5 to 15.0	0.22	99.78	5.1	0.993	0.987(0.986–0.988)	0.987	5.67(0.003)