TABLE 1. Predictors of Image Quality: Patient Analysis.
| Image Quality |
|||||
|---|---|---|---|---|---|
| Predictors | Optimal (n = 128) | Adequate (n = 134) | Poor (n = 29) | Odds Ratio | p |
| Age (y) | 0.98 | 0 .10 | |||
| Mean | 59.4 | 5 9.1 | 59.8 | ||
| SD | 10.0 | 9.7 | 12.2 | ||
| Sex (%) (no. / total no. in image quality category) | |||||
| Male (n = 214) | 78 (100/128) | 72 (96/134) | 62 (18/29) | 1.00 | Reference |
| Female (n = 77) | 22 (28/128) | 28 (38/134) | 38 (11/29) | 1.49 | 0.49 |
| Ethnicity (%) (no. / total no. in image quality category) |
|||||
| White (n = 196) | 58 (74/128) | 75 (100/134) | 76 (22/29) | 1.00 | Reference |
| Asian (n = 66) | 35 (45/128) | 14 (19/134) | 7 (2/29) | 2.67 | 0.06 |
| Black (n = 18) | 3 (4/128) | 7 (9/134) | 17 (5/29) | 0.58 | 0.04 |
| Other (n = 11) | 4 (5/128) | 4 (6/134) | 0 (0/29) | 2.83 | 0 .19 |
| Body mass index (kg/m2) | |||||
| Mean | 26.2 | 28.3 | 29.8 | 0.89 | < 0.001 |
| SD | 4 .1 | 4.3 | 4.6 | ||
| CAC score (Agatston units) | |||||
| Mean | 143.4 | 140.4 | 128.6 | 1.00 | 0.77 |
| SD | 159.6 | 15 9.1 | 15 6.1 | ||
| Heart rate (bpm) | |||||
| Mean | 55.8 | 59.8 | 66.5 | 0.90 | < 0.001 |
| SD | 10.7 | 12 .1 | 7. 8 | ||
| Heart rate variability (beats per scan) | 1.00 | 0.75 | |||
| Mean | 4.8 | 6.3 | 10.8 | ||
| SD | 16 .1 | 12.7 | 1 7.7 | ||
| Breath artifact present (no.)a | 0 | 15 | 7 | 4.97 | < 0.001 |
| Ectopy present (no.)a | 2 | 7 | 3 | 2.69 | 0 .16 |
Note—CAC = coronary artery calcifcation, bpm = beats per minute.
a
These results are also on the per-patient level; for example, in two patients with optimal image quality at least one ectopic beat was present.