Table 6. Performances Based on Chest CTs Varied by Presence and Duration of Symptoms.
| Classifiers | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) |
|---|---|---|---|---|
| Symptomatic patients (n = 99) | ||||
| Formal radiology report | 80.9 (38/47; 66.7–90.9) | 76.9 (40/52; 63.2–87.5) | 76.0 (38/50; 61.8–86.9) | 81.6 (40/49; 68.0–91.2) |
| CAD | 78.7 (37/47; 64.3–89.3) | 53.8 (28/52; 49.5–67.8) | 60.7 (37/61; 47.3–72.9) | 73.7 (28/38; 56.9–86.6) |
| Asymptomatic patients (n = 20) | ||||
| Formal radiology report | 85.7 (6/7; 42.1–99.6) | 53.8 (7/13; 25.1–80.8) | 50.0 (6/12; 21.1–78.9) | 87.5 (7/8; 47.3–99.7) |
| p values* | 0.757 | 0.096 | 0.075 | > 0.999 |
| CAD | 100 (7/7; 59.0–100) | 46.2 (6/13; 19.2–74.9) | 50.0 (7/14; 23.0–77.0) | 100 (6/6; 54.1–100) |
| p values* | 0.326 | 0.619 | 0.465 | 0.31 |
| Patients with duration of symptom ≤ 3 days (n = 72) | ||||
| Formal radiology report | 75.8 (25/33; 57.7–88.9) | 76.9 (30/39; 60.7–88.9) | 73.5 (25/34; 55.6–87.1) | 78.9 (30/38; 62.7–90.4) |
| CAD | 78.8 (26/33; 61.1–91.0) | 56.4 (22/39; 39.6–72.2) | 60.5 (26/43; 44.4–75.0) | 75.9 (22/29; 56.5–89.7) |
| Patients with duration of symptom > 3 days (n = 24) | ||||
| Formal radiology report | 92.9 (13/14; 66.1–99.8) | 70.0 (7/10; 34.8–93.3) | 81.3 (13/16; 54.4–96.0) | 87.5 (7/8; 47.3–99.7) |
| p values* | 0.245 | 0.69 | 0.728 | > 0.999 |
| CAD | 78.6 (11/14; 49.2–95.3) | 50.0 (5/10; 18.7–81.3) | 68.8 (11/16; 41.3–89.0) | 62.5 (5/8; 24.5–91.5) |
| p values* | > 0.999 | 0.737 | 0.763 | 0.655 |
Numbers in parentheses indicate numerators/denominators; 95% confidence intervals. *Comparison with performances in symptomatic patients, †Comparison with performances in patients with duration of symptom ≤ 3 days.