Table 2. Clinical characteristics and radiation tests of the study population.
| Overall population (n = 16431) | IHD patients (n = 10350) | Non-IHD patients (n = 6081) | P value | |
| Age (years) mean±SD | 62±13 | 62±12 | 62±15 | 0.450 |
| Male sex, n (%) | 11,348 (69) | 8,125 (78) | 3,223 (53) | <0.001 |
| ACS, n (%) | 3055(30) | |||
| STEMI/nSTEMI, n(%) | 1,668(16) | |||
| Previous MI, n (%) | 5,182(50) | |||
| Stable angina, n (%) | 2,825(27) | |||
| Variant angina/Syndrome X/etc, n (%) | 1,773(17) | |||
| Cardiomyopathy, n (%) | 1,823 | 869 (8) | 954(15) | |
| Other (valvular and pericardial disease, etc), n (%) | 4,355(42) | 2,009 (19) | 2,346(38) | <0.001 |
| History of cigarette smoking, n (%) | 7,797(47) | 5,770(56) | 2,027(33) | <0.001 |
| Hypercholesterolemia, n.(%) | 6,768 (41) | 4,786 (46) | 1,982 (33) | <0.001 |
| Diabetes mellitus, n.(%) | 2,885 (17) | 2,060 (20) | 825 (14) | <0.001 |
| Hypertension, n.(%) | 7,446 (45) | 4,631 (45) | 2,815 (46) | 0.054 |
| Coronary angiographies, n (%); | 13,604 (82) | 10,977(106) | 2,627(43) | <0.001 |
| PCIs, n (%) | 5,353(52) | <0.001 | ||
| Number of PCI treated vessels, n (%) | 6,838 (66) | |||
| Thallium or Sestamibi scan, n (%) | 3,918(24) | 3,109 (30) | 809 (13) | <.0001 |
| Cumulative estimated effective dose mSv/pt (median, andinter-quartile range) | 17(12–38) | 27(12–49) | 12(4–19) | <.0001 |
MI: myocardial infarction. PCI: percutaneous coronary intervention. STEMI: ST Elevation Myocardial Infarction. nSTEMI: non ST Elevation Myocardial Infarction.