Baseline Characteristics of the Study Population
| Variable | Overall (n = 214) | Patients With Symptom-Driven ECG (n = 108) | Patients With Protocol-Driven ECG (n = 106) |
|---|---|---|---|
| Demographics | |||
| Age, y | 64.1 ± 14.7 | 59.1 ± 16.3 | 69.3 ± 10.7a |
| Male | 115 (53.7) | 55 (50.9) | 44 (41.5) |
| History | |||
| Obesity (BMI >30 kg/m2) | 41 (19.2) | 12 (11.1) | 29 (27.4)a |
| Smoking | |||
| Current smoker | 36 (16.8) | 17 (15.7) | 19 (17.9) |
| Past history of smoking | 72 (33.6) | 23 (21.3) | 49 (46.2)a |
| No history of smoking | 72 (33.6) | 42 (38.9) | 30 (28.3) |
| Unknown | 34 (15.9) | 26 (24.1) | 8 (7.5)a |
| Alcohol abuse | 10 (4.7) | 5 (4.6) | 5 (4.7) |
| Hypertension | 87 (40.7) | 31 (28.7) | 56 (52.8)a |
| Diabetes | 66 (30.8) | 10 (9.3) | 56 (52.8)a |
| Hypercholesterolemia | 54 (25.2) | 20 (18.5) | 34 (32.1)a |
| Atrial fibrillation or flutter | 23 (10.7) | 13 (12.0) | 10 (9.4) |
| Other arrhythmia | 12 (5.6) | 6 (5.6) | 6 (5.7) |
| Coronary heart disease | 21 (9.8) | 4 (3.7) | 17 (16.0)a |
| TIA or ischemic stroke | 13 (6.1) | 6 (5.6) | 7 (6.6) |
| Valvular heart disease | 9 (4.2) | 6 (5.6) | 3 (2.8) |
| Heart failure | 8 (3.7) | 5 (4.6) | 3 (2.8) |
| Chronic obstructive pulmonary disease | 21 (9.8) | 9 (8.3) | 12 (11.3) |
| Peripheral vascular disease | 19 (8.9) | 4 (3.7) | 15 (14.2)a |
| Chronic renal failure | 26 (12.1) | 9 (8.3) | 17 (16.0) |
| eGFR of those with chronic renal failure (mL/min/1.73m2) | 50.3 ± 6.0 | 48.9 ± 8.6 | 51.0 ± 4.5 |
| Medication | |||
| Beta blocker | 42 (19.6) | 15 (13.9) | 27 (25.5)a |
| Calcium-channel blocker | 31 (14.5) | 11 (10.2) | 20 (18.9) |
| Digoxin | 1 (0.5) | 0 (0) | 1 (0.9) |
| Potassium-channel blocker | 2 (0.9) | 2 (1.9) | 0 (0) |
| Sodium-channel blocker | 1 (0.5) | 1 (0.9) | 0 (0) |
BMI = body mass index; ECG = electrocardiography; eGFR = estimated glomerular filtration rate; TIA = transient ischemic attack.
Note: Data are presented as mean ± SD for continuous variables and no. (%) for categorical variables.
↵a P <.05.