Table 3.
The quality assessment of the included studies.
| Included studies | Study population selection | Comparability between group | Comparability between group | Levels |
|---|---|---|---|---|
| Komlos et al. (2021) | ✩✩✩✩ | ✩✩ | ✩✩✩ | 9✩ |
| Chen et al. (2021) | ✩✩✩ | ✩✩ | ✩✩✩ | 8✩ |
| Shin et al. (2019) | ✩✩✩ | ✩✩✩ | ✩✩ | 8✩ |
| Laprise et al. (2016) | ✩✩ | ✩✩ | ✩✩✩ | 7✩ |
| Moraes et al. (2016) | ✩✩ | ✩ | ✩✩ | 5✩ |
| Narayan et al. (2014) | ✩✩✩✩ | ✩✩ | ✩✩✩ | 9✩ |
| Moergel et al. (2013) | ✩✩✩✩ | ✩✩ | ✩✩ | 8✩ |
| Tezal et al. (2009) | ✩✩✩✩ | ✩✩ | ✩✩✩ | 9✩ |
| De Rezende et al. (2008) | ✩✩✩ | ✩✩✩ | ✩✩ | 8✩ |
| Tezal et al. (2007) | ✩✩✩✩ | ✩✩ | ✩✩✩ | 9✩ |
| Chang et al. (2007) | ✩✩✩✩ | ✩✩ | ✩✩✩ | 9✩ |
| Guha et al. (2007) | ✩✩✩ | ✩✩ | ✩✩✩ | 8✩ |
| Rosenquist et al. (2005) | ✩✩✩ | ✩ | ✩✩ | 6✩ |
| Garrote et al. (2001) | ✩✩✩✩ | ✩✩✩ | ✩✩ | 9✩ |
| Bundgaard et al. (1995) | ✩✩✩ | ✩✩ | ✩✩ | 7✩ |
| Zheng et al. (1990) | ✩✩✩✩ | ✩✩✩ | ✩✩ | 9✩ |