Table 2. Final results of classification using the Nearest Neighbour (NN) classifier.

DICHOTOMIES DISCRIMINATED	% CORRECT CLASSIFICATION
CaP vs Benign	(80±5)
Age: ≤65 vs >65	84
Gleason score: <7 vs ≥7	71
PSAtot (ng/mL): <10 vs ≥10 ng/mL	42

The 10-fold cross validation procedure was used in order to estimate the mean performance of the signature and the confidence interval. CaP versus benign specimens were discriminated with (80±5)% accuracy, (81±6)% sensitivity and (78±7)% specificity. The result is expressed as mean±95% confidence interval, approximately corresponding to 2 standard deviations.