Adherence is a multi-dimensional construct in the POUNDS LOST trial
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Research on the conceptualization of adherence to treatment has not addressed a key question: Is adherence best defined as being a uni-dimensional or multi-dimensional behavioral construct? The primary aim of this study was to test which of these conceptual models best described adherence to a weight management program. This ancillary study was conducted as a part of the POUNDS LOST trial that tested the efficacy of four dietary macronutrient compositions for promoting weight loss. A sample of 811 overweight/obese adults was recruited across two clinical sites, and each participant was randomly assigned to one of four macronutrient prescriptions: (1) Low fat (20% of energy), average protein (15% of energy); (2) High fat (40%), average protein (15%); (3) Low fat (20%), high protein (25%); (4) High fat (40%), high protein (25%). Throughout the first 6 months of the study, a computer tracking system collected data on eight indicators of adherence. Computer tracking data from the initial 6 months of the intervention were analyzed using exploratory and confirmatory analyses. Two factors (accounting for 66% of the variance) were identified and confirmed: (1) behavioral adherence and (2) dietary adherence. Behavioral adherence did not differ across the four interventions, but prescription of a high fat diet (vs. a low fat diet) was found to be associated with higher levels of dietary adherence. The findings of this study indicated that adherence to a weight management program was best conceptualized as being multi-dimensional, with two dimensions: behavioral and dietary adherence.
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- Adherence is a multi-dimensional construct in the POUNDS LOST trial
Journal of Behavioral Medicine
Volume 33, Issue 1 , pp 35-46
- Cover Date
- Print ISSN
- Online ISSN
- Springer US
- Additional Links
- Randomized controlled trial
- Lifestyle behavior modification
- Author Affiliations
- 1. Pennington Biomedical Research Center, LSU System, 6400 Perkins Rd., Baton Rouge, LA, USA
- 2. Department of Nutrition, Harvard School of Public Health, Boston, MA, USA
- 3. National Heart, Lung, and Blood Institute, Bethesda, MD, USA