Percent weight loss (%WL) is recommended as the standard metric for reporting weight loss after RYGB because it is least influenced by preoperative BMI.
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%WL may suit RYGB outcome reporting; leaves open prospective validation before standard adoption.
Of the metrics examined, %WL is the parameter describing WL after RYGB least influenced by pBMI. It thus improves comparison of WL outcomes across studies of patients undergoing surgery and facilitates the most sensitive identification of novel predictors of surgery-induced WL. We therefore is recommend that %WL be adopted more broadly in reporting weight loss after RYGB.
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Hatoum et al. (2013) studied this question.
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