Table 1.
Variables | All Participants | Men | Women | P |
---|---|---|---|---|
(N=13,973) | (N=5,908) | (N=8,065) | Value6 | |
Percent (%) | ||||
Gender (Women) | 57.7% | |||
Race (Black) | 26.7% | 22.9% | 29.6% | <0.001 |
Hypertension1 | 33.4% | 32.1% | 34.4% | 0.004 |
Diabetes Mellitus | 10.9% | 10.7% | 11.1% | 0.406 |
Angina Pectoris by Rose questionnaire | 4.2% | 2.5% | 5.4% | <0.001 |
LVH by Cornell Voltage2 | 2.1% | 2.6% | 1.8% | 0.001 |
Major_ST Depression3 | 1.2% | 1.3% | 1.2% | 0.710 |
Major_STT Abnormality3 | 4.2% | 3.5% | 4.7% | <0.001 |
Mean + Standard Deviation | ||||
Age (years) | 54.4±5.7 | 54.8±5.8 | 54.2±5.7 | <0.001 |
Heart Rate (beats/per min) | 66.4±10.2 | 64.7±10.2 | 67.6±10.1 | <0.001 |
QTrr (ms) | 415.1±15.8 | 414.1±13.9 | 415.9±17.1 | <0.001 |
Frontal plane QRS axis (degree)5 | 30.9±31.6 | 27.6±33.0 | 33.3±30.3 | <0.001 |
Frontal plane T axis (degree)5 | 37.9±28.6 | 36.3±30.1 | 39.1±27.4 | <0.001 |
QRS/T Spatial (degree) | ||||
At 75th, 90th, 95th percentiles7 | 84, 104, 117 | 93, 112, 123 | 77, 96, 110 | |
All Participants | 67.2±28.0 | 75.2±27.7 | 61.4±26.8 | <0.001 |
Black8 | 69.1±31.0 | 81.8±29.1 | 61.8±29.7 | <0.001 |
White8 | 66.5±26.8 | 73.2±27.0 | 61.2±25.5 | <0.001 |
QRS/T Frontal (degree) | ||||
At 75th, 90th, 95th percentiles7 | 31, 51, 69 | 32, 54, 73 | 31, 50, 67 | |
All Participants | 23.9±24.0 | 24.7±25.1 | 23.3±23.1 | 0.001 |
Black8 | 26.0±27.8 | 26.9±29.2 | 25.5±27.0 | 0.118 |
White8 | 23.1±22.3 | 24.1±23.7 | 22.3±21.1 | <0.001 |
T wave Axis Spatial (degree) | ||||
At 75th, 90th, 95th percentiles7 | 32, 43, 54 | 32, 41, 51 | 32, 45, 56 | |
All Participants | 26.0±16.1 | 25.8±14.4 | 26.1±17.3 | 0.377 |
Black8 | 31.8±18.9 | 32.3±17.4 | 31.4±19.8 | 0.158 |
White8 | 23.8±14.4 | 23.9±12.8 | 23.8±15.6 | 0.793 |
Note: Hypertension at baseline (Systolic blood pressure ≥ 140 or diastolic blood pressure ≥ 90), or on antihypertensive medication.
Left Ventricular Hypertrophy by Cornell Voltage (CV = RaVL + SV3): LVH_CV cut point at CV ≥ 2200 for Women, and CV ≥ 2600 for Men.
Major ST Depression: Minnesota Code in 4.1 or 4.2. Major_STT Abnormality: Minnesota Code in 5.1 or 5.2; or 4.1 or 4.2;
The ECG variables were categorized as: abnormal (≥95th percentile), borderline (≥ 75th and < 95th percentile), and normal (<75th percentile), separately for men and women.
For Frontal plane QRS-axis or Frontal plane T-axis from the GE Marquette Program.
For significant statistical test between men and women.
The values of spatial QRS/T angle, frontal QRS/T angle and T wave axis at, 75th, 90th, 95th percentiles.
Among total 13,973 participants, 10,236 for White (45.5% for Men and 55.5% for Women), and 3,737 for Black (36.2% for Men and 63.8% for Women)