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This study was undertaken to determine whether psychosocial factors determined during a pre-operative semi-structured psychiatric interview were associated either with the amount of weight loss following obesity surgery or with dropping out from follow-up after surgery. Multiple regression and discriminant function analysis of weight loss at six, twelve, twenty four and thirty six months showed no correlation between psychosocial variables and the amount of weight lost or with dropping out from follow-up. It is concluded that the type of psychiatric interview performed in this study does not yield information which reliably predicts weight loss after surgery for obesity.

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