Table 1.
Baseline demographic and clinical characteristics.
| Variables | ≤50 Years | 51–70 Years | >70 Years | P-value |
|---|---|---|---|---|
| Number (%) | 2755 (35%) | 4110 (52%) | 1065 (13%) | |
| Sex (females) | 12.5 | 24.7 | 30.8 | 0.001 |
| Diabetes mellitus | 30.9 | 44.9 | 45.6 | 0.001 |
| Hypertension | 34 | 53.8 | 59.7 | 0.001 |
| Dyslipidemia | 29.9 | 41 | 42.8 | 0.001 |
| Current smoker | 67.3 | 48.1 | 33.7 | 0.001 |
| Renal failure | 1.3 | 4.5 | 9.5 | 0.001 |
| Family history of CAD | 13.4 | 11.1 | 8.6 | 0.001 |
| Prior MI | 14.1 | 21.9 | 26.6 | 0.001 |
| Prior PCI | 6.5 | 11 | 9.5 | 0.001 |
| Prior CABG | 1.5 | 5.1 | 7.9 | 0.001 |
| Prior stroke | 1.7 | 4.8 | 9.3 | 0.001 |
| Prior PAD | 0.8 | 2.1 | 3.7 | 0.001 |
| Heart rate (beats/min) (mean ± SD) | 83.6 ± 18 | 84.8 ± 20.9 | 85.6 ± 22 | 0.001 |
| Systolic blood pressure (mmHg) (mean ± SD) | 132.9 ± 26 | 137 ± 30 | 136 ± 31 | 0.001 |
| Diastolic blood pressure (mmHg) (mean ± SD) | 82.7 ± 17.5 | 81.2 ± 17.8 | 77.9 ± 18 | 0.001 |
| Body mass index (Kg/m2) (mean ± S.D) | 27 ± 5 | 27.2 ± 5.5 | 26 ± 5.4 | 0.001 |
| Fasting blood sugar (mmol/l) (mean ± S.D) | 7.2 ± 3.3 | 7.5 ± 3.2 | 7.1 ± 2.9 | 0.001 |
| Total cholesterol (mmol/l) (mean ± S.D) | 5.0 ± 1.3 | 4.9 ± 1.6 | 4.7 ± 2.1 | 0.001 |
| Serum triglyceride (mmol/l) (mean ± S.D) | 2.0 ± 1.3 | 1.8 ± 1.05 | 1.5 ± 0.8 | 0.001 |
| Low-Density Lipoprotein (mmol/l) (mean ± S.D) | 3.3 ± 1.2 | 3.1 ± 1.4 | 2.8 ± 1.2 | 0.001 |
| High-Density Lipoprotein (mmol/l) (mean ± S.D) | 1.01 ± 0.5 | 1.1 ± 0.5 | 1.1 ± 0.4 | 0.001 |
| Troponin T (mean ± S.D) | 1.21 ± 0.4 | 1.3 ± 0.44 | 1.24 ± 0.42 | 0.001 |
| Hemoglobin A1c (mean ± S.D) | 7.6 ± 2.4 | 7.8 ± 2.4 | 7.5 ± 2.2 | 0.09 |
| Killip class >1 | 14.3 | 24.9 | 62.1 | 0.001 |
| Symptom >12 h | 58.3 | 59 | 54.9 | 0.49 |
| Ischemic chest pain | 90.2 | 82.9 | 73.0 | 0.001 |
| Atypical chest pain | 4.1 | 5.3 | 6.6 | 0.001 |
| Dyspnea | 3.3 | 7.7 | 14.1 | 0.001 |
| ST-elevation MI | 55.4 | 40.7 | 31.6 | 0.001 |
| NST-elevation MI | 23.8 | 31.3 | 41.7 | 0.001 |
| Unstable angina | 20.3 | 26.9 | 25.1 | 0.001 |
CAD = coronary artery disease, MI = myocardial infarction, PCI = percutaneous coronary intervention, CABG = coronary artery bypass graft, PAD = peripheral arterial disease, NST = non-ST.