Table 2. Exercise electrocardiography and coronary computed tomography findings by troponin quintile.
| Cardiac troponin I concentrations by quintile (ng/L) | ||||||
|---|---|---|---|---|---|---|
| Q1 (≤0.82) |
Q2 (0.83-1.16) |
Q3 (1.17-1.61) |
Q4 (1.62-2.66) |
Q5 (>2.66) |
p-value | |
| Exercise ECG performed, % | 162 (83.9) | 161 (86.6) | 153 (84.1) | 149 (77.6) | 145 (79.2) | 0.129 |
| Exercise ECG outcome | <0.001 | |||||
| Normal, % | 123 (84.2) | 109 (71.2) | 93 (64.1) | 86 (62.3) | 64 (47.1) | |
| Inconclusive, % | 11 (7.5) | 24 (15.7) | 23 (15.9) | 26 (18.8) | 29 (21.3) | |
| Abnormal, % | 12 (8.2) | 20 (13.1) | 29 (20.0) | 26 (18.8) | 43 (31.6) | |
| Coronary calcium score | 0.0 [0.0, 31.0] | 10.0 [0.0, 123.00] | 49.0 [0.0, 316.5] | 118.0 [1.8, 629.3] | 140.0 [4.0, 739.5] | <0.001 |
| Coronary disease on CT, % | <0.001 | |||||
| No significant CHD, % | 107 (55.4) | 78 (41.9) | 55 (30.1) | 44 (22.9) | 37 (20.2) | |
| Non-obstructive CHD, % | 67 (34.7) | 69 (37.1) | 75 (41.0) | 78 (40.6) | 59 (32.2) | |
| Obstructive CHD, % | 18 (9.3) | 39 (21.0) | 53 (29.0) | 70 (36.5) | 87 (47.5) | |
| SSS Score | 0.0 [0.0, 2.0] | 1.0 [0.0, 6.0] | 3.0 [0.0, 10.0] | 5.0 [1.0, 12.0] | 7.0 [1.0, 14.0] | <0.001 |
Data are median [IQR], or value (%); ECG, electrocardiography; IQR, interquartile range; CHD, coronary heart disease; SSS, segment stenosis score.