Table 1. Newcastle-Ottawa Quality Assessment Score for the 11 Studies Included in This Systematic Review.
| Source | Newcastle-Ottawa Quality Assessment Score, No. of Starsa | Risks of Bias | ||
|---|---|---|---|---|
| Selection | Comparability | Outcome | ||
| Durr et al,12 2017 | 3 | 1 | 2 | High or unclear |
| Hagen et al,8 2017 | 3 | 1 | 3 | High or unclear |
| Wohlgemuth et al,13 2017 | 3 | 1 | 3 | High or unclear |
| Ono et al,14 2016 | 3 | 1 | 3 | High or unclear |
| Sheikh et al,15 2015 | 3 | NA | 1 | High or unclear |
| Ramien et al,16 2014 | 2 | NA | 3 | High or unclear |
| Fahrni et al,4 2014 | 3 | NA | 2 | Moderate |
| Oduber et al,17 2010 | 3 | 1 | 3 | Moderate |
| Breugem et al,7 2004 | 3 | 1 | 3 | Moderate |
| Holme et al,18 2002 | 1 | 1 | 2 | High or unclear |
| Shakespeare et al,19 1998 | 2 | NA | 2 | High or unclear |
Abbreviation: NA, not available.
a
For selection, there are a maximum of 4 stars; comparability, maximum of 2 stars; and outcome, maximum of 3 stars. The higher the number of stars, the higher the quality of article.