Methodological quality of behavioural weight loss studies: a systematic review

Area of Science:

• Behavioral Science
• Obesity Research
• Clinical Trials Methodology

Background:

• Methodological rigor is crucial for evaluating the effectiveness of behavioral weight loss interventions.
• Assessing the quality of published studies informs future research and clinical practice.

Purpose of the Study:

• To systematically review the methodological quality of behavioral weight loss intervention studies in adults.
• To examine the association between study quality and statistically significant weight loss outcomes, intervention effectiveness, and sample size.

Main Methods:

• Searched PUBMED, MEDLINE, and PSYCINFO for trials published between January 2009 and December 2014, identifying 90 studies.
• Assessed methodological quality using indicators such as study design, anthropometric measurements, intent-to-treat (ITT) analysis, and loss to follow-up strategies.
• Analyzed associations between quality indicators and study outcomes, effect size, and sample size.

Main Results:

• Most studies employed randomized designs (100%), objective anthropometrics (96.7%), and ITT analysis (86.7%).
• High follow-up rates (>75%) and reporting of loss to follow-up strategies were common (62.2% and 69.9%, respectively).
• Intervention fidelity reporting (34.4%) and sampling from known populations (41.1%) were less common. Methodological quality was not associated with significant results, effect size, or sample size.

Conclusions:

• Published behavioral weight loss trials demonstrate high quality in specific areas like study design and measurement.
• Areas for improvement include more rigorous statistical approaches for handling loss to follow-up and enhanced reporting of intervention fidelity.