Table 2.

Results of Signal‐Averaged Electrocardiography Stratified for Gender and Age

	Mean	SD	2.5th	5th	Percentiles
					Median	95th	97.5th
Time‐Domain Analysis (all controls)
QRS duration (ms)	101	10	87	88	100	119	120
RMS 40 (μV)	32	23	6	9	28	64	96
AS 40 (ms)	34	9	19	21	33	49	54
Subgroup of Men (n = 76)
QRS duration (ms)	103a	9	87	88	102	119	122
RMS 40 (μV)	32	23	8	9	28	63	106
LAS 40 (ms)	34	8	20	21	33	49	54
Subgroup of Women (n = 34)
QRS duration (ms)	97a	9	78	86	94	119	119
RMS 40 (μV)	34	23	3	5	28	88	96
LAS 40 (ms)	33	10	12	19	32	54	57
Subgroup of Controls ≤45 Years (n = 56)
QRS duration (ms)	101	10	86	87	99	119	120
RMS 40 (μV)	38b	27	9	11	34	96	106
LAS 40 (ms)	32b	8	19	21	31	49	54
Subgroup of Controls ≥45 Years (n = 54)
QRS duration (ms)	102	9	89	90	101	118	119
RMS 40 (μV)	26b	17	6	8	22	60	62
LAS 40 (ms)	36b	9	20	22	35	50	54
Spectral Turbulence Analysis (all controls)c
LSCR	65	5	53	56	66	72	75
ISCM	94	1	92	92	94	96	96
ISCSD	84	21	49	54	81	118	137
Spectral Entropy	10	2	6	7	10	13	14

^a P < 0.05 for women versus men. ^b P < 0.05 for persons aged < 45 years versus ≥ 45 years. ^c p = n.s for differences between age and gender. ISCM = interslice correlation mean; ISCSD = interslice correlation standard deviation; LAS 40 = the terminal low amplitude (<40 mV) signal duration; LSCR = low slice correlations ratio; RMS 40 = root‐mean‐square voltage of the terminal 40 ms of the QRS complex.