The cost of health care continues to increase. Based on the biopsychosocial model of heath care, it has been shown that the treatment of psychological and social problems can have a cost offset effect on the cost of medical care. While this offset effect has been shown in an MFT population, there are no known studies that have looked at predictors of the change in medical use by those that receive marital and family therapy. This study looked at psychological and social measures of individuals who received marital and family therapy. These measures were evaluated based on the change from intake to one year post intake using best subsets multiple regression. The model for males showed variables that could be affected using a cognitive or cognitive-behavioral model of therapy. The model for females showed variables that could be affected using the emotionally focused model of therapy. The implications of this study are that a therapist could be the most effective in conjoint therapy if they apply concepts from both cognitive and emotionally focused therapeutic models.