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Table 4 Newcastle-Ottawa Scale score for included studies
| Studies | Total score (/9 points) |
|---|---|
| Arabi et al., 2012 [36] | 7 points |
| Bleicher et al., 2011 [38] | 9 points |
| Chen et al., 1997 [39] | 8 points |
| Hrafnkelsson et al., 2013 [31] | 8 points |
| Liu-Ambrose et al., 2006 [22] | 8 points |
| Milliken et al., 2008 [29] | 8 points |
| Cadogan et al. [34], | 8 points |
| Vicente-Rodriguez et al., 2005 [27] | 7 points |
| Young et al., 2001 [25] | 5 points |
| Heidemann et al. [32], | 6 points |
| Wang et al., 2007 [26] | 7 points |
| Sirola et al., 2006 [11] | 7 points |
| Sirola et al., 2005 [28] | 7 points |
| Sirola et al., 2006 [37] | 7 points |
| Kwon et al., 2007 [30] | 9 points |
