After a 4-week treatment , the reductions of SBP in aranidipine and retard-released felodipine groups were ( 12.1 11.0 ) mm Hg and ( 12.2 11.2 ) mm Hg while the reductions of DBP in two groups ( 11.8 6.9 ) mm Hg and ( 12.1 7.9 ) mm Hg respectively .