<qa>  What was the placebo-controlled study of nebivolol?This was a multi-center, randomized, double-blind, parallel group, placebo-controlled study of nebivolol over a range of doses in patients with mild to moderate hypertension. The study consisted of 2 phases: screeningwashoutsingle-blind placebo run-in followed by randomizationdouble-blind treatment. During the double-blind phase, patients received nebivolol or placebo. Patients had 7 scheduled clinical visits during the study. 