Subgroup analyses of overall TSS-BPH by baseline age ( 65 / > 65 years ) , history of erectile dysfunction ( yes/no ) , LUTS/BPH severity ( IPSS < / 20 ) , total testosterone level ( < 300/300ng/dL ) , and age-specific predicted prostate volume ( < 40/40mL ) showed no statistically significant treatment-subgroup interactions .