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| Characteristics of the 28 controls | Mean ± standard deviation |
|---|---|
| Length of follow-up (years) | 8.7±3.0 |
| Number of prostate biopsies per control | 2.7±1.3 |
| Serum PSA (ng/mL) | 8.57±3.17 |
| Percent free PSA (%) | 17.09±5.62 |
| Prostate volume (cc) | 68.13±26.71 |
| PSA density (ng/mL/cc) | 0.14±0.07 |
Positive linear correlation was identified between serum PSA and number of prostate biopsies in the 28 controls (correlation coefficient: 0.534; p= 0.005)
