Table 2.

Reproducibility agreement of GEH measurements on two 10-second ECG recordings, on N, S, and VP median beats.

	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)
N median beat (n=4,114)	Heart rate, bpm	61.5(9.4)	61.8(9.4)	−0.64	−5.68 to 5.21	0.34	99.66	4.5	0.978	0.956(0.953–0.959)	0.956	14.9(<0.001)
	Peak QRS-Tangle,°	44.1(36.4)	44.2(36.6)	−0.05	−21.2 to 21.1	0.08	99.92	24.1	0.978	0.956(0.954–0.959)	0.956	1.27(0.281)
	Area QRS-Tangle,°	64.3(34.7)	64.4(34.9)	−0.12	−14.8 to 14.5	0.19	99.81	11.5	0.988	0.977(0.976–0.978)	0.977	2.55(0.078)
	Peak SVG azimuth,°	−1.4(26.9)	−1.2(26.8)	−0.11	−18.5 to 18.3	0.07	99.93	5.2	0.968	0.939(0.935–0.942)	0.939	0.758(0.469)
	Area SVG azimuth,°	−17.5(25.9)	−17.0(25.9)	−0.48	−21.1 to 20.2	0.35	99.65	6.3	0.957	0.917(0.912–0.922)	0.917	4.34(0.013)
	Peak SVG elevation,°	71.0(14.4)	71.0(14.1)	−0.04	−6.80 to 6.72	0.07	99.93	4.9	0.985	0.970(0.969–0.972)	0.971	16.8(<0.001)
	Area SVG elevation,°	69.5(15.4)	69.6(15.3)	−0.08	−10.0 to 9.84	0.13	99.87	7.2	0.972	0.946(0.943–0.949)	0.946	1.25(0.286)
	Peak SVGmag,mV	1.56(0.45)	1.56(0.45)	0.001	−0.21 to 0.21	0.06	99.94	6.8	0.986	0.971(0.970–0.973)	0.971	0.09(0.918)
	SVG,mV*ms	66.8(27.0)	66.6(26.9)	0.14	−11.5 to 11.8	0.24	99.76	8.8	0.988	0.976(0.974–0.977)	0.976	1.38(0.253)
	VMQTi,mV*ms	96.7(30.7)	96.7(30.5)	0.10	−8.96 to 9.15	0.13	99.87	4.8	0.994	0.989(0.988–0.989)	0.989	3.80(0.022)
	SAIQRST,mV*ms	146.7(46.9)	146.5(46.6)	0.23	−14.6 to 15.1	0.20	99.80	5.2	0.993	0.987(0.986–0.988)	0.987	4.97(0.007)
S median beat (n=66)	Heart rate, bpm	73.6(16.3)	73.4(16.3)	0.20	−15.8 to 16.2	0.24	99.76	10.8	0.933	0.874(0.803–0.921)	0.875	0.02(0.980)
	Peak QRS-Tangle,°	74.1(51.3)	70.6(51.8)	3.50	−30.1 to 37.1	2.80	97.20	22.9	0.972	0.943(0.908–0.964)	0.954	1.36(0.265)
	Area QRS-Tangle,°	95.6(42.8)	94.2(41.3)	1.37	−33.2 to 35.9	1.39	98.61	18.4	0.954	0.912(0.860–0.945)	0.913	0.42(0.658)
	Peak SVG azimuth,°	23.7(45.7)	19.8(42.7)	3.89	−33.5 to 41.2	2.31	97.69	9.4	0.955	0.906(0.853–0.941)	0.913	2.99(0.057)
	Area SVG azimuth,°	17.9(50.5)	17.1(50.5)	0.71	−34.6 to 35.0	1.25	98.75	9.0	0.967	0.936(0.898–0.960)	0.936	0.05(0.950)
	Peak SVG elevation,°	80.0(19.8)	79.8(19.1)	0.27	−9.87 to 10.4	0.28	99.72	6.5	0.982	0.965(0.943–0.978)	0.965	0.68(0.511)
	Area SVG elevation,°	83.1(24.1)	82.2(21.9)	0.93	−20.6 to 22.4	0.63	99.37	13.3	0.942	0.886(0.822–0.928)	0.891	1.70(0.191)
	Peak SVGmag,mV	1.23(0.45)	1.25(0.45)	−0.02	−0.21 to 0.17	1.89	98.11	7.9	0.989	0.976(0.961–0.985)	0.977	2.08(0.133)
	SVG,mV*ms	40.9(17.9)	42.3(18.4)	−1.43	−17.1 to 14.3	2.81	97.19	19.0	0.949	0.900(0.842–0.937)	0.903	1.17(0.318)
	VMQTi,mV*ms	84.6(34.0)	84.7(34.6)	−0.06	−11.9 to 11.8	0.05	99.95	7.1	0.992	0.985(0.975–0.990)	0.985	0.28(0.759)
	SAIQRST,mV*ms	126.2(53.5)	125.7(54.6)	0.55	−20.1 to 21.2	0.30	99.70	8.2	0.991	0.981(0.969–0.988)	0.981	0.50(0.609)
VP median beat (n=19)	Heart rate, bpm	66.8(5.4)	66.5(5.3)	0.25	−3.0 to 3.5	0.35	99.65	2.5	0.953	0.952(0.880–0.981)	0.953	0.26(0.771)
	Peak QRS-Tangle,°	154.6(38.0)	154.8(33.7)	−0.17	−13.7 to 13.3	0.10	99.90	3.8	0.994	0.982(0.962–0.991)	0.989	5.76(0.012)
	Area QRS-Tangle,°	155.6(28.1)	156.6(26.5)	−1.03	−11.9 to 9.9	0.69	99.31	3.6	0.990	0.979(0.948–0.991)	0.981	1.13(0.292)
	Peak SVG azimuth,°	87.3(42.5)	89.6(43.2)	−2.26	−21.9 to 17.4	1.02	98.98	3.8	0.986	0.971(0.927–0.989)	0.973	0.49(0.621)
	Area SVG azimuth,°	53.9(67.6)	62.8(76.8)	−8.88	−64.4 to 46.7	4.47	95.53	10.9	0.964	0.916(0.806–0.965)	0.931	2.03(0.162)
	Peak SVG elevation,°	113.3(29.8)	112.6(30.1)	0.69	−12.9 to 14.3	0.61	99.39	6.2	0.986	0.973(0.931–0.989)	0.973	0.10(0.902)
	Area SVG elevation,°	104.1(33.3)	108.5(36.2)	−4.37	−24.9 to 16.2	4.07	95.93	9.4	0.979	0.947(0.873–0.978)	0.958	2.40(0.121)
	Peak SVGmag,mV	0.95(0.25)	0.98(0.25)	−0.03	−0.14 to 0.08	2.92	97.08	5.9	0.988	0.970(0.925–0.988)	0.977	2.54(0.108)
	SVG,mV*ms	45.4(25.7)	45.4(27.9)	0.03	−14.0 to 14.1	0.06	99.94	14.7	0.984	0.964(0.914–0.985)	0.967	0.90(0.425)
	VMQTi,mV*ms	194.9(86.6)	193.7(88.7)	1.18	−18.4 to 20.7	0.71	99.29	5.1	0.997	0.993(0.983–0.997)	0.994	0.54(0.593)
	SAIQRST,mV*ms	298.5(132.4	)297.1(135.4)	1.41	−26.7 to 29.5	0.51	99.49	4.8	0.997	0.994(0.985–0.998)	0.995	0.465(0.64)