Table 1. Baseline characteristics of the study group.
| APC |
|||
|---|---|---|---|
| No | Yes | ||
| (n = 7628) | (n = 64) | p | |
| Male, n (%) | 3159 (41.4%) | 32 (50.0%) | 0.165 |
| Age, years | 52.4 | 67.3 | <0.001 |
| BMI, kgm-2 | 22.9 | 22.0 | 0.022 |
| Systolic blood pressure (mmHg) | 135 | 148 | <0.001 |
| Diastolic blood pressure (mmHg) | 81 | 83 | 0.111 |
| Hypertension, n (%) | 1606 (21.1%) | 21 (32.8%) | 0.022 |
| Hypercholesterolemia, n (%) | 517 (6.8%) | 6 (9.4%) | 0.411 |
| Diabetes mellitus, n (%) | 362 (4.8%) | 4 (6.3%) | 0.59 |
| Current smoking, n (%) | 2185 (28.6%) | 16 (25.0%) | 0.521 |
| Drinking | |||
| Ex-drinker | 237 (3.1%) | 2 (3.1%) | 0.993 |
| Current drinker | 2156 (28.3%) | 16 (25%) | 0.564 |
| Laboratory tests | |||
| Total Cholesterol (mg/dL) | 204 | 203 | 0.892 |
| HDL Cholesterol (mg/dL) | 54 | 53 | 0.741 |
| Fasting blood glucose (mg/dL) | 103 | 106 | 0.218 |
| Creatinine (mg/dL) | 0.81 | 0.85 | 0.119 |
| Other ECG findings | |||
| QRS axis deviation, n (%) | 251 (3.3%) | 2 (3.1%) | 1 |
| High R, n (%) | 802 (10.5%) | 12 (18.8%) | 0.033 |
| ST depression, n (%) | 184 (2.4%) | 6 (9.4%) | 0.005 |
| T-wave abnormality, n (%) | 605 (7.9%) | 15 (23.4%) | <0.001 |
| Bundle branch block, n (%) | 559 (7.3%) | 4 (6.3%) | 1 |
| Rotation, n (%) | 3810 (50%) | 35 (54.7%) | 0.45 |
Abbreviations: APC, atrial premature complex; BMI, body mass index; HDL, high density lipoprotein; ECG, electrocardiogram. All values are expressed as the mean ± SD or as a number with the percentage of participants in parentheses.