Table 2. The predictors of a positive initial biopsy in multivariate analysis.
| Variables | Odds ratio | 95% CI | P | |
|---|---|---|---|---|
| Lower | Upper | |||
| Age at biopsy | 1.0 | 1.0 | 1.1 | 0.026 |
| Log (PSA) | 9.9 | 6.1 | 16.0 | <0.001 |
| Log (prostate volume) | 0.06 | 0.02 | 0.16 | <0.001 |
| Diagnostic % free PSA | 7.1 | 0.1 | 366.6 | 0.331 |
| DRE | ||||
| Negative | Reference | |||
| Positive | 2.8 | 1.7 | 4.7 | <0.001 |
| TRUS findinga | ||||
| Negative | Reference | |||
| Positive | 1.5 | 0.7 | 3.4 | 0.302 |
Abbreviations: CI, confidence interval; PCa, prostate cancer; PSA, prostate-specific antigen; TRUS, transrectal ultrasound; DRE, digital rectal examination.
a
Low-echogenicity in the peripheral zone of the prostate was defined as ‘positive' other findings were defined as ‘negative'.