Table 4. Individuals classified by whether they were judged to have a malignant skin lesion as judged by histology and by GP diagnosis.

	Histology malignant	Histology benign	Total
Malignant diagnosis by GP	21	35	56
No malignant diagnosis by GP	12	355	367
Total	33	390	423

GP=general practitioner.

Sensitivity=63.6% (49.3–75.4).

Specificity=91.0% (88.5–93.1).

Positive predictive value=37.5% (27.6–48.5).

Negative predictive value=96.7% (94.8–98.0).