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Abstract
This prospective study investigated personality traits as predictors of the outcome in a 52-week weight-loss program for obesity. Personality traits were rated with the Inventory of Interpersonal Problems (IIP) in 54 consecutive obese outpatients when entering a multimodal weight-reduction program. The value of these variables to predict success was assessed after 12, 26, and 52 weeks of treatment. A stepwise linear regression analysis for all follow-ups was calculated to examine the impact of each IIP subscale on weight reduction. The IIP subscale “intrusive or needy” significantly correlated with weight reduction observed at every follow-up examination and accounts for 13.6% to 29.8% of the variance (p values < .05). Obese patients describing themselves as excessively friendly, outgoing, and sociable improved more from a weight-loss program than those with lower instances of these traits. Accordingly, personality traits deserve more attention at initial assessment and while planning treatment of obese patients.