Table 1.
Sample Characteristics
| Characteristic | Total Sample Examinations = 17,731 |
|---|---|
| Age (years) | 54 ± 16 |
| Women | 9684 (55%) |
| Body mass index (kg/m2) | 26.4 ± 4.7 |
| Systolic blood pressure (mm Hg) | 130 ± 20 |
| Diastolic blood pressure (mm Hg) | 78 ± 11 |
| Hypertension | 7090 (40%) |
| Antihypertensive treatment | 3477 (20%) |
| Diabetes mellitus | 1496 (8%) |
| Smoking | 6999 (39%) |
| Prior myocardial infarction or heart failure | 774 (4%) |
| QRS (ms) | 79 ± 14 |
| QRS width (ms) | |
| <100 | 16494 (93%) |
| 100 to <120 | 772 (4%) |
| ≥120 | 465 (3%) |
| Right bundle-branch block | 307 (2%) |
| Left bundle-branch block | 105 (1%) |
| Indeterminate bundle-branch block | 53 (0.3%) |
| Atrioventricular nodal blocking medications | |
| Beta-blockers | 9.3 |
| Calcium channel blockers | 3.2 |
| Cardiac glycosides | 2.4 |
Values shown are mean ± SD or number (%).