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Forest plot of BMI (A) and waist circumference (B) level after RYGB surgery compared to medical treatment. Both BMI (MD: –6.54, 95% CI: –9.28 to –3.80, P < 0.001) and waist circumference (MD: –15.60, 95% CI: –18.21 to –13.00, P < 0.001) were lower in the RYGB group than the medical group. BMI = body mass index, CI = confidence interval, MD = mean difference, RYGB = Roux-en-Y gastric bypass.
