Table 6 Performance of the PSAD cutoff levels in screening 72 patients with “grey zone PSA” (4–10 ng/ml)

Sensitivity

33.3 %: 95 % CI (20–41 %)

86.7 %: 95 % CI (58–98 %)

Specificity

85.7 %: 95 % CI (77–95 %)

20 %: 95 % CI (10–33 %)

Positive predictive value

38.2 %

22.4 %

Negative predictive value

82.8 %

84.9 %

Positive likelihood ratio

2.33: 95 % CI (0.89–6.12)

1.08: 95 % CI (0.85–1.37)

Negative likelihood ratio

0.78: 95 % CI (0.54–1.13)

0.68: 95 % CI (0.17–2.7)