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Reporting weight change: standardized reporting accounting for baseline weight.
Steven H Belle1, Paul D Berk, Anita P Courcoulas
1University of Pittsburgh Graduate School of Public Health, Department of Epidemiology, Pittsburgh, Pennsylvania.
Summary
A new method for reporting weight change after bariatric surgery, the adjusted percent of weight loss (A%WL), allows for better comparisons between patient groups. This standardized approach is crucial for interpreting outcomes across studies.
Area of Science:
- Bariatric surgery outcomes research
- Obesity and weight management studies
Background:
- Standardized reporting of weight change is crucial for comparing bariatric surgery outcomes.
- Current methods lack consensus, hindering meaningful cross-study comparisons.
- The Longitudinal Assessment of Bariatric Surgery (LABS) provides a valuable dataset for analysis.
Purpose of the Study:
- To propose a standardized method for reporting weight change after bariatric surgery.
- To demonstrate the utility of this method using LABS data.
- To facilitate meaningful comparisons among different bariatric surgery cohorts.
Main Methods:
- Described relationships among various weight change measures.
- Utilized data from an observational, longitudinal cohort study of bariatric surgery patients.
- Employed simulation studies to illustrate the proposed method's impact.
Main Results:
- Baseline weight significantly influences weight change assessment.
- Unadjusted weight loss comparisons favored certain procedures, but adjustments revealed different outcomes.
- Adjusted weight loss showed significant differences between groups even with moderate sample sizes.
Conclusions:
- A consistent metric for reporting weight loss post-bariatric surgery is essential.
- The adjusted percent of weight loss (A%WL) accounts for baseline weight differences.
- Using A%WL can alter the interpretation of bariatric surgery outcomes compared to unadjusted measures.
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