1.3. Analysis.

Comparison 1 Surgery versus non‐surgery, Outcome 3 BMI reduction.

BMI reduction
Study	Outcome	Surgery	No surgery	P‐value
Dixon 2008	Reduction in BMI at 2 years, mean	7.4	0.5
Dixon 2008
Dixon 2012	BMI loss at 2 years, mean	9.7	1.5
Dixon 2012
Mingrone 2012	BMI change from baseline at 2 years, mean (SD)	‐33.31 (7.88)	‐4.73 (6.37)
Mingrone 2012
Schauer 2012	BMI reduction at 12 months, mean (SD): LRYGB	‐10.2 (3.1)	‐1.9 (2.9)	P < 0.001
Schauer 2012	BMI reduction at 12 months, mean (SD): LSG	‐9.0 (2.7)	‐1.9 (2.9)