Authors: A W van de Laar M H Dollé L M de Brauw S C Bruin Y I Acherman
Publish Date: 2014/02/23
Volume: 24, Issue: 7, Pages: 1085-1089
Abstract
Percentage alterable weight loss AWL is the only known weight loss metric independent of the initial body mass index BMI a unique feature ideal for use in weight loss research AWL was not yet validated The aim of the study is to validate the AWL metric and to confirm advantages over the excess weight loss EWL metricAWL is tested with 2year weight loss results of all primary laparoscopic RouxenY gastric bypass patients operated in our hospital Nadir results of patients with higher and lower initial BMI are compared Mann–Whitney p 005 using outcome metrics BMI percentage weight loss WL EWL and AWL for the whole group for each gender and for 40 and ≥40 years separatelyFivehundred patients 401 female out of 508 984 had 2year followup Of all four metrics only AWL rendered results not significantly influenced by initial BMI The AWL outcome is initial BMI independent for both genders and agegroups Results also confirm that women and younger patients had significantly higher AWL outcomeThe recently developed AWL metric defined as 100 × initialBMI − BMI / initialBMI − 13 is now validated In contrast to the wellknown outcome metrics BMI EWL and WL the AWL metric is independent of the initial BMI It should replace the misleading EWL metric for comparing weight loss results in bariatric research and for expressing the effectiveness of bariatric procedures This effectiveness does not act on the total body mass or on the excess part but on the alterable part defined as BMI minus 13 kg/m2 for all adult patients female male young and old
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