Table 1. Characteristics of 1,381 patients.
| Total subjects (N = 1381) | |
| Age (years) | 66.2±7.3 |
| Prostate volume (ml) | |
| Total prostate volume | 48.5±25.9 |
| Transitional zone volume | 24.1±22.4 |
| Prostate specific antigen (ng/ml) | 2.71±3.53 |
| International Prostatic Symptom Score (IPSS) | |
| IPSS-total | 17.9±7.9 |
| IPSS-storage | 7.1±3.5 |
| IPSS-emptying | 10.8±5.5 |
| IPSS-quality of life | 3.9±1.2 |
| Uroflowmetry parameters | |
| Maximum flow rate (ml/sec) | 11.6±4.9 |
| Post-void residual volume (ml) | 58.1±77.8 |
| Urodynamic study parameters | |
| Maximal urethral closure pressure (cmH2O) | 74.3±26.8 |
| Functional urethral length (mm) | 72.0±20.6 |
| First desire (ml) | 203.0±90.1 |
| Normal desire (ml) | 284.9±108.2 |
| Strong desire (ml) | 371.7±108.3 |
| Compliance (ml/cmH2O) | 67.3±50.8 |
| PdetQmax (cmH2O) | 52.6±21.7 |
| Opening pressure (cmH2O) | 54.3±25.8 |
| Bladder outlet obstruction index | 35.1±25.2 |
PdetQmax, detrusor pressure at maximum flow rate.