At a baseline voided volume of @ to less than @ ml the median change in the maximum urinary flow rate was @ and @ ml per second ( p = @ ) in @ patients , at a baseline of @ to @ ml the change was -@ and @ ml per second ( p = @ ) in @ , and at a baseline of greater than @ ml the change was -@ and @ ml per second ( p = @ ) in @ for placebo and tadalafil , respectively .