Table 2. – Evaluation of methodological quality of the studies included in the systematic review according to the Newcastle Ottawa Scale.
| Study | Selection | Comparability of cohorts based on design or analysis | Outcome of each study | Total stars |
|---|---|---|---|---|
| Benson et al. (2012) | 4 stars | SP | 3 stars | 7 |
| Bogaert et al. (2003) | 4 stars | 1 star | 3 stars | 8 |
| Falaschetti et al. (2001) | 4 stars | SP | 3 stars | 7 |
| Howe et al. (2010) | 4 stars | 1 star | 3 stars | 8 |
| Larsson et al (2010) | 4 stars | SP | 3 stars | 7 |
| Mehta et al (2002) | 4 stars | 1 star | 3 stars | 7 |
| Wilke et al. (2016) | 4 stars | SP | 3 stars | 7 |
| Yamazaki (2008) | 4 stars | SP | 3 stars | 7 |