Table 1:
Baseline population characteristics
| Internal Population (N=20418) |
External Population (N=9019) |
p-value | |
|---|---|---|---|
| Age, median (IQR) | 64 (56, 73) | 68 (60, 75) | <0.001 |
| Male, n (%) | 11642 (57.0%) | 4871 (54.0%) | <0.001 |
| Typical chest pain, n (%) | 1224 (6.0%) | 133 (1.5%) | <0.001 |
| Atypical chest pain, n (%) | 4589 (22.5%) | 3208 (35.6%) | <0.001 |
| Outpatient, n (%) | 18417 (90.2%) | 8169 (90.6%) | 0.326 |
| Inpatient, n (%) | 1535 (7.5%) | 832 (9.2%) | <0.001 |
| Emergency department, n (%) | 466 (2.3%) | 18 (0.2%) | <0.001 |
| Body mass index, median (IQR) | 27.3 (24.6, 30.9) | 29.4 (25.8, 33.3) | <0.001 |
| Past Medical History, n (%) | |||
| Hypertension | 12920 (63.3%) | 5736 (63.6%) | 0.600 |
| Dyslipidemia | 12903 (63.2%) | 1979 (21.9%) | <0.001 |
| Diabetes mellitus | 5212 (25.5%) | 2726 (30.2%) | <0.001 |
| Peripheral vascular disease | 2420 (11.9%) | 2834 (31.4%) | <0.001 |
| Prior CAD | 5796 (28.4%) | 1606 (17.8%) | <0.001 |
| Prior myocardial infarction | 2768 (13.6%) | 677 (7.5%) | <0.001 |
| Prior PCI | 3967 (19.4%) | 839 (9.3%) | <0.001 |
| Smoking, n (%) | 3875 (19.0%) | 2841 (31.5%) | <0.001 |
| Family History, n (%) | 5642 (27.6%) | 4720 (52.3%) | <0.001 |
| Exercise stress, n (%) | 9457 (46.3%) | 5318 (59.0%) | <0.001 |
| Abnormal perfusion, n (%) | 4106 (20.1%) | 2003 (22.2%) | <0.001 |
Population characteristics for the internal and external populations. CAD – coronary artery disease, IQR – interquartile range, PCI – percutaneous coronary intervention.