Table 2.
Assessment of the methodological quality of the studies according to the Newcastle–Ottawa Scale (NOS).
| Author | Year | Country | Surgical Procedures |
Selection (/4) |
Comparability (/2) |
Outcome (/3) |
Total (/9) |
|---|---|---|---|---|---|---|---|
| Melissas | 2005 | Greece | VBG | 4 | 0 | 3 | 7 |
| Khoueir | 2009 | USA | RYGB or DS or SG | 4 | 0 | 3 | 7 |
| Josbeno | 2010 | USA | LRYGB | 4 | 0 | 3 | 7 |
| Lidar | 2012 | Israel | LAGB or SG or LRYGB or DS | 4 | 0 | 3 | 7 |
| Vincent | 2012 | USA | LRYGB or LAGB | 4 | 1 | 3 | 8 |
| Çakır | 2015 | Turkey | SG | 4 | 0 | 3 | 7 |
| Gallart-Aragón | 2018 | Spain | SG | 4 | 0 | 3 | 7 |
| Bhandari | 2019 | India | SG or one-anastomosis gastric bypass or LRYGB | 4 | 0 | 3 | 7 |
Note: A study awarded seven or more stars is regarded as a high-quality study.