Table 2. Baseline Characteristics and Biopsy Results Categorized in Different Baseline PSA Levels.

Variable	PSA 0.01–4.00 ng/ml	PSA 4.01–10.00 ng/ml	PSA >10.00 ng/ml	PSA unknown	Whole
No. of patients	132	345	587	49	1113
Age (yr), mean ± SD (range)	66.8±8.3 (37–86)	68.6±8.5 (26–91)	71.4±7.8 (37–89)	71.4±8.7 (42–84)	70.0±8.3 (26–91)
No. of patients biopsied within three months (rate)	31 (23.5%)	142 (41.2%)	409 (69.7%)	4 (8.2%)	586 (52.7%)
No. of patients biopsied positive within three months (rate)	6 (6/31, 19.4%)	55 (55/142, 38.7%)	278 (278/409, 68.0%)	1 (1/4, 25.0%)	340 (340/586, 58.0%)

PSA: prostate specific antigen.