Predictors of success after a 2-year lifestyle intervention for morbid obese patients at Røros Rehabilitering Center
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Background: Lifestyle treatment can produce good short-term results in the treatment of morbid obesity, but relapse is a common problem. Therefore it is important to identify predictors of longterm success after lifestyle interventions for morbid obese individuals, so that resources can be used in an effect way. Purpose: The purpose of this study was to identify predictors of weight-loss maintenance after a 2- year intermittent residential lifestyle intervention for morbid obese patients. Material and Method: This study was a 2-year retrospective cohort study of 422 morbid obese patients referred to Røros Rehabilitation Centre (RRC) since 2005. Two years data was available for 286 participants, 66,6% were women. Mean age was 41 +/- 9.6 years and mean BMI: 42.8 +/- 4.9kg/m2. Baseline anthropometric, socio-demographic and psychosocial variables and earlier outcome results were tested as predictors using multiple linear regression analysis. Results: Average weight loss at 2 years was 10.2+/-11.4kg. The main finding of this study was that weight loss at first visit and at first homestay were positive predictors and depression at baseline a negative predictor for weight loss at two years. Each 1kg lost at first Røros stay was associated with an average weight loss of 1.3kg after 2 years and a weight loss of 1kg at first homestay was associated with a 1.0kg weight loss after two years. Each additional point on the HADS depression scale at baseline was associated with less 0.7 kg weight loss after two years. Age, gender, baseline waistline, BMI, VO2 peak and anxiety, initial changes in VO2 peak and quality of life assessed by SF-36, were not significant predictors. The full model (with 14 variables) had a R-square of 42.6% (adjusted R-square: 36.8%). Conclusion: Iinitial weight loss is a significant positive predictor, while a high depression score at baseline is a negative predictor for long-term weight loss after an intermittent lifestyle intervention for morbid obesity.