Table 1.

Study population demographics and ECG trait descriptive statistics for the unrelated (n= 3,054) JHS participants.

Study Population Characteristics (n=3,054)
Variable	Mean or %	Standard Deviation (minimum, maximum)
Age (yrs)	56.5	±11.73 (21, 85)
% Female	62	-
% Cardiovascular disease	11	-
P duration (msec)	118.5	±13.08 (80, 170)
PR duration (msec)	171.6	±33.02 (0,338)
QRS duration (msec)	92.3	±10.12 (64, 120)
QT duration (msec)	414.7	±27.64 (290, 580)
QTc duration (msec)	426.4	±27.64 (334, 594)
P axis (degrees)	48	±21.06 (−136, 151)
QRS axis (degrees)	16.9	±31.18 (−137, 157)
T axis (degrees)	30.6	±40.03 (−179, 179)
Heart rate (beats/min)	64.6	±10.72 (30, 118)