Table 3.
Predicted proportions (% or per 100 readings) of true positive, false positive, true negative, false negative, sensitivity, and specificity of the radiologists for different image positions within a batch of screen readings
| Image position | True positive, per 1000 | False positive, % | True negative, % | False negative, per 1000 | Sensitivity of the radiologists’ scores, % | Specificity for the radiologists’ scores, % |
|---|---|---|---|---|---|---|
| 10 | 4.0 (3.8–4.2) | 5.4 (4.8–5.9) | 94.4 (94.0–94.8) | 0.60 (0.53–0.67) | 88.6 (87.6–89.5) | 94.8 (94.4–95.2) |
| 20 | 4.0 (3.7–4.2) | 5.3 (4.7–5.8) | 94.5 (94.1–94.9) | 0.60 (0.53–0.67) | 88.4 (87.4–89.4) | 94.9 (94.5–95.3) |
| 30 | 4.0 (3.8–4.2) | 5.2 (4.7–5.7) | 94.6 (94.2–94.9) | 0.61 (0.54–0.68) | 88.2 (87.2–89.2) | 95.0 (94.6–95.4) |
| 40 | 4.0 (3.7–4.2) | 5.1 (4.6–5.6) | 94.6 (94.3 –95.0) | 0.61 (0.54–0.68) | 88.0 (87.0–89.0) | 95.1 (94.7–95.5) |
| 50 | 3.9 (3.7–4.1) | 5.0 (4.5–5.5) | 94.7 (94.4–95.1) | 0.62 (0.54–0.69) | 87.8 (86.8–88.8) | 95.2 (94.8–95.5) |
| 60 | 3.9 (3.7–4.1) | 4.9 (4.4–5.4) | 94.8 (94.4–95.2) | 0.62 (0.55–0.69) | 87.7 (86.6–88.7) | 95.2 (94.9–95.6) |
| 70 | 3.9 (3.7–4.1) | 4.9 (4.4–5.5) | 94.9 (94.5–95.3) | 0.62 (0.55–0.70) | 87.5 (86.4–88.5) | 95.3 (94.9–95.6) |
| 80 | 3.9 (3.6–4.1) | 4.8 (4.3–5.3) | 95.0 (94.6–95.3) | 0.63 (0.55–0.70) | 87.3 (86.2–88.3) | 95.4 (95.0–95.7) |
| 90 | 3.8 (3.6–4.0) | 4.7 (4.3–5.2) | 95.0 (94.7–95.4) | 0.63 (0.56–0.71) | 87.1 (86.0–88.1) | 95.5 (95.1–95.8) |
| 100 | 3.8 (3.6–4.0) | 4.6 (4.1–5.1) | 95.1 (94.8–95.5) | 0.64 (0.56–0.72) | 86.9 (85.8–88.0) | 95.5 (95.2–95.9) |
| 150 | 3.7 (3.4–3.9) | 4.3 (3.8–4.7) | 95.5 (95.2–95.8) | 0.66 (0.57–0.76) | 85.9 (84.7–87.0) | 95.9 (95.6–96.2) |
| 200 | 3.6 (3.3–3.9) | 3.9 (3.5–4.3) | 95.8 (95.5–96.1) | 0.69 (0.57–0.81) | 84.8 (83.5–86.0) | 96.2 (95.9–96.5) |
| 300 | 3.4 (3.0–3.8) | 3.3 (2.9–3.7) | 96.4 (96.1–96.7) | 0.74 (0.56–0.92) | 82.4 (81.0–83.8) | 96.8 (97.1–96.6) |