Table 3. Diagnostic parameters of the genetic test (LOH) and f/tPSA ratios (threshold values: 15, 20 and 25 %) for 81 patients with a total PSA between 4 and 10 ng ml⁻¹.

	Sensitivity %	Specificity %	χ2 (P-value)
Genetic test (LOH)	87	44	P=0.002
f/tPSA <25%	95	12	P=0.309
f/tPSA <20%	86	33	P=0.09
f/tPSA <15%	55	74	P=0.006
LOH or f/tPSA <15%	100	32	P=0.06