Table 3. Mean Values, Standard Deviations and Normal 2^nd to 98^th Percentile Range for Key ECG Parameters from the Repolarization Model by Race.

	All Women	White	African-American	Hispanic	Asian/Pacific
† RTepi	327 ; 17.1 293→364	327 ; 16.8 294→364	324 ; 19.2** 284→366	326; 17.7NS 292→365	330 ; 17.4*** 298→369
† RTxd	296; 20.2 254→339	297 ; 19.7 256→339	292 ; 23.7*** 240→343	294 ; 21.1*** 249→338	297; 21.7NS 252→345
‡ APDepi	288; 17.1 253→325	288; 16.8 254→324	286; 19.1NS 246→326	288; 17.8** 253→327	293; 17.7*** 258→332
‡ APDxd	286 ; 20.2 244→329	287 ; 19.7 246→329	282 ; 23.7*** 230→333	284 ; 21.1*** 239→328	287 ; 21.7NS 242→335
§ QRp	39 ; 4.8 30→50	39 ; 4.8 30→50	38 ; 4.8*** 30→50	38 ; 4.8*** 30→50	39 ; 4.9 * 30→50
‖ RNDPV	41 ; 15.7 19→82	41 ; 15.3 22→70	46 ; 17.6*** 21→93	43 ; 15.7*** 20→85	47 ; 18.0*** 20→96
# θ(Rm|Tm)	43 ; 21.6 9→97	43 ; 21.4 13→82	43 ; 24.0NS 8→108	40 ; 21.7*** 8→96	39; 22.0*** 9→99
†† θ(Rp|Tp)	33 ; 22.1 5→103	33 ; 21.7 8→72	36 ; 25.3*** 6→116	30 ; 22.4*** 5→105	30 ; 24.0*** 5→118
‡‡ θ(Tp|Tref)	17 ; 13.3 2→53	17 ; 12.8 4→38	21 ; 17.4*** 3→74	18 ; 13.2NS 3→53	17 ; 13.4NS 2→51
§§ θ(Tinit|Term)	31.2 ; 11.5 10→58	31.4 ; 11.3 15→50	30.9 ; 13.1* 8→61	30.6 ; 11.8** 10→59	27.8 ; 10.4NS 8→52
‖‖ θ(Tinit|Tref)	18 ; 13.4 3→53	18 ; 13.0 4→40	22 ; 16.8*** 3→72	18 ; 12.7NS 3→52	17 ; 13.1NS 2→49
## θ(Tterm|Tref)	28 ; 9.0 11→39	27 ; 8.5 16→36	30 ; 13.7*** 11→51	29 ; 8.5*** 14→39	28 ; 8.9** 13→40
††† SToV	32 ; 17.1 6→74	31 ; 16.3 9→62	42 ; 20.2*** 10→93	35 ; 17.4*** 6→76	40 ; 19.5*** 9→85
††† ToV	103 ; 39.6 38→198	102 ; 38.6 46→171	114 ; 44.1*** 42→221	110 ; 41.6*** 39→205	122; 45.7*** 48→235
††† TpV	346 ; 123.8 122→629	349 ; 122.0 163→565	314 ; 131.8*** 95→648	340; 128.4** 111→624	366 ; 136.7*** 118→628
‡‡‡ ToV/TpV	0.31 ; 0.079 0.18→0.52	0.30 ; 0.073 0.20→0.42	0.38* ; 0.097 0.22→0.64	0.33 ; 0.083*** 0.20→0.55	0.35 ; 0.084*** 0.21→0.55

^***Signifies P<0.0001,

^**P<0.001,

^*=P<0.05 and NS nonsignificant for mean differences from white women.

^†RT_epi is epicardial repolarization time and RT_xd a representative value of subendocardial repolarization time.

^‡APD_epi = RT_epi - ET_epi, and APD_endo = RT_xd - ET_endo, where ET_epi and ET_endo are epicardial excitation time (=QRp) and endocardial excitation time (taken as 10 ms).

^§QRp = interval from QRSonset to the peak of QRS vector magnitude curve.

^‖RNDPV = QRS nondipolar voltages (square roots of the total variance of components 4 to 8 from singular value decomposition).

^#θ(R_m|T_m) = spatial angle between the mean QRS and T vectors.

^††θ(Rp|T_p) = spatial angle between the peak QRS and T vectors.

^‡‡θ(T_p|T_ref) = spatial angle between the Tp vector and the reference T vector (Tref), signifying spatial deviation angle of repolarization direction from the direction of the normal repolarization sequence.

^§§θ(T_init|T_erm) = spatial angle between the mean initial and terminal T vectors from quintiles 1-3 and quintiles 4-5 of global T wave, respectively.

^‖‖θ(T_init|T_ref) = spatial angles between the mean initial T vector and Tref vector.

^##θ(T_term|T_ref) = spatial angle between the mean terminal T vector and Tref vector.

^†††Symbol 'V' with ST_oV, T_oV and T_pV signifies vector magnitude of ST_o, T_o and T_p, respectively.

^‡‡‡T_oV/T_pV is the magnitude ratio of T_oV and T_pV vectors.