Participants were randomly assigned to receive mindfulness-based stress reduction therapy ( n = 58 ) , consisting of 9 sessions ( 8 weekly 2.5-hour group sessions and a daylong retreat ) focused on teaching patients to attend to the present moment in a nonjudgmental , accepting manner ; or present-centered group therapy ( n = 58 ) , an active-control condition consisting of 9 weekly 1.5-hour group sessions focused on current life problems .