Table 2. MPI parameters of segments and CAG results of coronary arteries.
| MPI parameters and CAG results | Training set | Testing set | P value |
|---|---|---|---|
| Number of segments, n | 126 | 126 | |
| MBF (mL/g/min) | 0.57 [0.46–0.76] | 0.65 [0.48–0.79] | 0.336 |
| EXT (%) | 21 [9–50] | 25 [8–48] | 0.989 |
| TPD (%) | 20 [8–46] | 21 [6–44] | 0.977 |
| SRS | 6 [2–10] | 6 [2–10] | 0.877 |
| Number of LAD/LCX/RCA, n | 42/42/42 | 42/42/42 | |
| Vascular stenosis of 3 vessels | |||
| Yes | 79 (62.7) | 82 (65.1) | 0.694 |
| No | 47 (37.3) | 44 (34.9) | |
| Vascular stenosis of LAD | |||
| Yes | 31 (73.8) | 30 (71.4) | 0.807 |
| No | 11 (26.2) | 12 (28.6) | |
| Vascular stenosis of LCX | |||
| Yes | 18 (42.9) | 20 (47.6) | 0.661 |
| No | 24 (57.1) | 22 (52.4) | |
| Vascular stenosis of RCA | |||
| Yes | 30 (71.4) | 32 (76.2) | 0.620 |
| No | 12 (28.6) | 10 (23.8) |
Continuous variables with a non-normal distribution are presented as median [interquartile range], and classification variables are presented as n (%). MPI, myocardial perfusion imaging; CAG, coronary angiography; MBF, myocardial blood flow; EXT, defect extent; TPD, total perfusion deficit; SRS, summed rest score; LAD, left anterior descending coronary artery; LCX, left circumflex coronary artery; RCA, right coronary artery.