Table 1. Patient characteristics and coronary CT angiography parameters.
| Before matching | After matching | ||||||
|---|---|---|---|---|---|---|---|
| APSCM group (n = 96) | BMI-based group (n = 107) | SMD | p value | BMI-based group (n = 96) | SMD | p value | |
| Age, years† | 58.1 ± 13.8 | 56.4 ± 12.3 | 0.1315 | 0.354 | 57.0 ± 12.0 | 0.0734 | 0.53 |
| Male sex, n (%) | 47 (49.0) | 47 (43.9) | 0.0754 | 0.564 | 45 (46.9) | 0.0415 | 0.87 |
| BMI (kg/m2) | 31.8 (30.8–33.2) | 31.3 (30.8–32.9) | 0.0278 | 0.695 | 31.3 (30.8–32.8) | 0.0219 | 0.89 |
| 30–35 kg/m2 | 85 (88.5) | 93 (86.9) | 0.87 | 84 (87.5) | 0.983 | ||
| 35–40 kg/m2 | 10 (10.4) | 12 (11.2) | 10 (10.4) | ||||
| >40 kg/m2 | 1 (1.0) | 1 (0.9) | 2 (2.1) | ||||
| HR, beats/min‡ | 60 (55–67.5) | 60 (56–65) | 0.1019 | 0.672 | 60 (56–65) | 0.1009 | 0.35 |
| Scan mode | 0.915 | > .9999 | |||||
| Flash mode, n (%) | 29 (30.2) | 32 (29.9) | 30 (31.2) | ||||
| Axial mode, n (%) | 67 (69.8) | 75 (70.1) | 0.0087 | 66 (68.8) | 0.0226 | ||
| Tube potential | < 0.0001 | < 0.0001 | |||||
| 80 kV, n (%) | 2 (2.1) | 0 (0) | 0 (0) | ||||
| 100 kV, n (%) | 28 (29.2) | 0 (0) | 0 (0) | ||||
| 120 kV, n (%) | 46 (47.9) | 107 (100) | 96 (100) | ||||
| 140 kV, n (%) | 20 (20.8) | 0 (0) | 0 (0) | ||||
| Tube current-time product, mAs† | 363.0 ± 37.4 | 384.7 ± 30.6 | < 0.0001 | 385.2 ± 31.7 | < 0.0001 | ||
APSCM, automatic tube potential selection with tube current modulation; BMI, body mass index; CT, computed tomography; SMD, standardized mean difference, HR, heart rate.
† Data are expressed as means ± standard deviations.
‡ Data are expressed as medians, with interquartile ranges in parentheses.