Table 1: Baseline characteristics of T2DM patients with BMI < 35 kg/m2.

Author Year Procedure Female/male Mean age (range) Mean followup (range) Mean duration of diabetes Insulin user 1 Lee 2011 MGB, RYGB 62 38/24 43.1 24 months 5.4 years 23% () 2 Boza 2011 RYGB 30 17/13 48.0 (28–65) 24 months () 4 years 3.3% () 3 de Sa 2011 RYGB 27 — 50.3 20 (4–86) months 8.8 years 22% () 4 Huang 2011 RYGB 22 20/2 47.4 (28–63) 12 months 6.6 years 18.2% () 5 Scopinaro 2011 BPD 30 11/19 56.4 (43–69) 12 months 11.2 years 40% () 6 Shah 2010 RYGB 15 7/8 45.6 9 months 8.7 years 80% () 7 Lee 2010 SG 20 14/6 46.3 12 months >6 months 20% () 8 DePaula 2009 II-SG, II-DSG 58 (30,28) 18/40 51.4 (40–66) 19.2 (14–28) months 9.6 years 37.9% () 9 DePaula 2009 II-DSG 69 22/47 51.4 (41–63) 21.7 (7–42) months 11 years 44% () 10 Ramos 2009 DJB 20 9/11 43.0 (29–60) 6 months 5.3 years 0% () 11 Ferzli 2009 DJB 7 — 43.3 (33–52) 12 months 10.7 years 85.7% () 12 Geloneze 2009 DJB 12 3/9 50.0 6 months 9 years 100% () 13 Chiellini 2009 BPD 5 2/3 48.0 18 months 3–15 years — 14 Lee 2008 MGB 44 38/6 39.0 1–5 years — — 15 Scopinaro 2007 BPD 7 2/5 49.0 (39–60) 13 (10–18) years 4.1 years 0% () 16 Cohen 2007 DJB 2 0/2 47.0 (43–51) 9 months 4.5 years 100% () 17 Cohen 2006 RYGB 37 30/7 34.0 (28–45) 20 (6–48) months — 0% () 18 Noya 1998 BPD-SPP 10 5/5 52.1 (40–62) 7 (2–18) months — 40% () Total — — 477 236/207 — — — 30.1% (129/428) Weighted mean — — — — 47 22 months 8.2 years —

RYGB: Roux-en-Y gastric bypass, MGB: mini-gastric bypass, BPD: biliopancreatic diversion, SG: sleeve gastrectomy, II-SG: ileal interposition with sleeve gastrectomy, II-DSG: ileal interposition with diverted sleeve gastrectomy, DJB: duodenal jejunal bypass, BPD-SPP: stomach- and pylorus-preserving BPD.