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Reporting weight change: standardized reporting accounting for baseline weight.
MedLine Citation:
PMID:  23337770     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Although it is recognized that a standardized approach to reporting weight change is essential to meaningful comparisons among cohorts and across studies, consensus is lacking. This study aimed to propose a method of reporting weight change that would allow meaningful comparisons among studies of patients who underwent bariatric surgery and to demonstrate its utility using an example from the Longitudinal Assessment of Bariatric Surgery (LABS). METHODS: Relationships among several measures of weight change are described. Results from an observational, longitudinal cohort study of adults undergoing bariatric surgery and from simulation studies are used to illustrate the proposed method. RESULTS: Baseline weight is a critical parameter when assessing weight change. Men undergoing a bariatric procedure other than gastric bypass or adjustable band tended to have greater weight loss 12 months after surgery than men undergoing gastric bypass when not accounting for baseline weight, but the opposite was found when results were adjusted for baseline weight. Simulation results show that with relatively modest sample sizes, the adjusted weight loss was significantly different between the 2 groups of men. CONCLUSION: A consistent metric for reporting weight loss after bariatric surgery is essential to interpret outcomes across studies and among subgroups. The baseline weight adjusted percent of weight loss (A%WL) uses a standard population (e.g., the LABS cohort) to account for differences between cohorts with respect to baseline weight, and its use can change the interpretation of results compared with an unadjusted measure.
Authors:
Steven H Belle; Paul D Berk; Anita P Courcoulas; Scott Engel; David R Flum; William Gourash; Mary Horlick; Jesse Y Hsu; Saurabh Khandelwal; James E Mitchell; Robert W O'Rourke; Walter Pories; Beth Schrope; Bruce Wolfe;
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-14
Journal Detail:
Title:  Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery     Volume:  -     ISSN:  1878-7533     ISO Abbreviation:  Surg Obes Relat Dis     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2013-1-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101233161     Medline TA:  Surg Obes Relat Dis     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 American Society for Metabolic and Bariatric Surgery. All rights reserved.
Affiliation:
University of Pittsburgh Graduate School of Public Health, Department of Epidemiology, Pittsburgh, Pennsylvania. Electronic address: belle@edc.pitt.edu.
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