Table 1.

Characteristics of the study population at baseline examination by spatial T wave axis extreme quartiles. The ARIC Study. Mean (SD) and percentages

Variable (units)	Spatial T wave axis deviation quartile
	Women, n = 7143		Men, n = 5133
	T axis quartile 1: 0.33–14.75°	T axis quartile 4: 30.20–60.76°	T axis quartile 1: 0.19–16.19°	T axis quartile 4: 30.41–60.88°
Age (years)	53.5 (5.7)	53.7 (5.6)	54.4 (5.7)	54.4 (5.7)
African-American %	18.4	41.7	13.0	32.1
Height (cm)	162.3 (5.9)	161.9 (6.0)	176.5 (6.2)	175.5 (6.7)
Weight (Lb)	151.7 (32.5)	168.6 (37.8)	182.3 (30.8)	190.6 (31.8)
BMI (kg/m*m)	26.2 (5.4)	29.2 (6.3)	26.6 (4.1)	28.1 (4.3)
WHR	0.88 (0.08)	0.90 (0.08)	0.96 (0.06)	0.96 (0.05)
Smokers %	26	21	32	29
SBP (mmHg)	116.8 (18.2)	122.9 (19.4)	118.8 (15.5)	126.1 (18.5)
DBP (mmHg)	70.3 (10.3)	74.2 (11.1)	73.3 (9.8)	78.2 (11.6)
HTN %	25	43	22	44
Glucose (mmol/L)	5.8 (2.3)	6.1 (2.5)	5.8 (1.4)	6.2 (2.3)
Diabetes %	8	13	7	14
HDL-C (mmol/L)	1.5 (0.4)	1.5 (0.4)	1.2 (0.4)	1.2 (0.4)
LDL-C (mmol/L)	3.5 (1.0)	3.6 (1.0)	3.6 (1.0)	3.6 (1.0)
Total Cholesterol (mmol/L)	5.6 (1.1)	5.7 (1.1)	5.4 (1.0)	5.5 (1.0)
Tri-glyc. (mmol/L)	1.3 (0.8)	1.4 (1.0)	1.6 (1.2)	1.7 (1.1)
QRS axis (degrees)	52.5 (30.0)	32.8 (32.0)	52.1 (34.3)	24.0 (35.9)
Cornell voltage (uV)	926.1 (400.6)	1188.9 (437.4)	1165.6 (44.7)	1489.8 (490.6)
QT interval (ms)	394.2 (27.4)	403.9 (28.3)	395.0 (29.2)	400.1 (29.8)
Heart rate (bpm)	70.2 (9.8)	67.7 (9.9)	62.3 (10.3)	66.7 (10.1)
QTc (ms)	399.2 (18.5)	403.9 (19.1)	415.0 (16.4)	418.5 (18.7)
T axis frontal plane (degrees)	61.5 (12.3)	38.3 (25.4)	62.2 (12.5)	31.4 (26.8)
Minor T wave abn.%	5.3	16.4	3.8	16.8

BMI = Body Mass Index, WHR = waist-to-hip-ratio, QTc = QT interval corrected for heart rate. bpm = beats per minute. SBP, DBP systolic and diastolic blood pressure, HTN, hypertension