Table 4.
Clinical validity of symptoms1 in terms of sensitivity, specificity and positive predictive value (PPV)
| Clinical validity | Lump | Retraction | Scar | Secretion | Mole | Any of the symptoms |
|---|---|---|---|---|---|---|
| True positives | 497 | 242 | 966 | 43 | 963 | 2,314 |
| True negatives | 1,176,796 | 1,171,248 | 1,052,715 | 1,187,883 | 1,041,738 | 895,980 |
| False positives | 15,090 | 20,638 | 139,171 | 3,922 | 150,066 | 295,906 |
| False negatives | 6,027 | 6,282 | 5,558 | 6,481 | 5,561 | 4,210 |
| Sensitivity % | 7.62 (7.04–8.32) | 3.71 (3.27–4.20) | 14.8 (14.0–15.7) | 0.66 (0.48–0.89) | 14.8 (13.9–15.7) | 35.5 (34.3–36.6) |
| Specificity % | 98.7 (98.7–98.8) | 98.3 (98.2–98.3) | 88.3 (88.3–88.4) | 99.7 (99.7–99.7) | 87.4 (87.3–87.5) | 75.2 (75.1–75.3) |
| Positive predictive value % | 3.19 (2.92–3.48) | 1.16 (1.02–1.32) | 0.69 (0.65–0.73) | 1.08 (0.79–1.47) | 0.64 (0.60–0.68) | 0.78 (0.74–0.81) |
1
Symptoms include women, radiographer reported or both.