Study characteristics and quality evaluation of each selected study
| Characteristic | Lee et al. (14) | Woelnerhanssen et al. (15) | Helmiö et al. (16) | Kehagias et al. (17) | Ramón et al. (18) |
|---|---|---|---|---|---|
| Jadad score | 5 | 5 | 4 | 5 | 4 |
| Double blind | 2 | 2 | 1 | 2 | 1 |
| Randomization | 2 | 2 | 2 | 2 | 2 |
| Lost to follow-up | 1 | 1 | 1 | 1 | 1 |
| Country | Taiwan, China | Switzerland | Finland | Greece | Spain |
| Clinical trial registration | NCT00540462 | NCT00356213 | NR | NR | NR |
| Study period | Sept. 1, 2007 to June 30, 2008 | NR | March 2008 to June 2010 | January 2005 to February 2007 | April 2007 to March 2008 |
| Publication year | 2011 | 2011 | 2012 | 2011 | 2012 |
| No. patients | 60 | 23 | 238 | 60 | 15 |
| LRYGB | 30 | 12 | 117 | 30 | 7 |
| LSG | 30 | 11 | 121 | 30 | 8 |
| Follow-up, mo | 12 | 12 | 1 | 36 | 12 |
| BMI | 30.3 (25–34) | > 40, with comorbidity | 44.6 (35–66) | < 50 | > 40 or BMI > 35 with comorbidity |
| Condition | T2DM | Nondiabetic morbidly obese | Morbid obesity | Nonsuperobese | Nonsuperobese |
| Age, yr | 45 (34–58) | < 60 | 49 (23–67) | NR | 18–60 |
| Deaths | 0 | 0 | 0 | 0 | NR |
BMI = body mass index; LRYGB = laparoscopic Roux-en-Y gastric bypass; LSG = laparoscopic sleeve gastrectomy; NR = not reported; T2DM = type 2 diabetes mellitus.