Table 3 The Newcastle–Ottawa scale
Study | Selection | Comparability | Exposure | Quality score | |||||
|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 1 | 1 | 2 | 3 | ||
Schilling et al., 2001 | ★ | ☆ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 6 |
Blewett et al., 2001 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 7 |
Homesh et al., 2006 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ☆ | 6 |
Egberts et al., 2008 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 7 |
Kawoosa et al., 2011 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 7 |
Klink et al., 2012 | ★ | ★ | ☆ | ★ | ★★ | ★ | ★ | ★ | 8 |
Zhai et al., 2015 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 7 |
Huang et al., 2015 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 7 |
Workum et al., 2016 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 7 |
Liu et al., 2017 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 7 |
Gooszen rt al, 2018 | ★ | ★ | ☆ | ★ | ★★ | ★ | ★ | ★ | 8 |
Shao et al., 2018 | ★ | ★ | ☆ | ★ | ★★ | ★ | ★ | ★ | 8 |
Schroder et al., 2019 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 7 |
Chidi et al., 2020 | ★ | ☆ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 6 |
Workun et al., 2020 | ★ | ★ | ☆ | ★ | ★★ | ★ | ★ | ★ | 8 |
Jezerskyte et al., 2020 | ★ | ★ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 7 |
Takahashi et al., 2021 | ★ | ☆ | ☆ | ★ | ★☆ | ★ | ★ | ★ | 6 |