Table 3. Quality assessment of eligible studies with Newcastle-Ottawa Scale.
First author | Year | NOS | Selection | Comparability | Outcome |
---|---|---|---|---|---|
Bian | 2015 | 6 | ★★★* | ★ | ★★* |
Chang | 2015 | 8 | ★★★ | ★★ | ★★★ |
Cinti | 2008 | 7 | ★★★ | ★★ | ★★ |
Han | 2011 | 7 | ★★★* | ★* | ★★★ |
Kobayashia | 2006 | 6 | ★★★ | ★ | ★★* |
Liang | 2015 | 6 | ★★* | ★★* | ★★* |
Luber | 2011 | 7 | ★★★ | ★ | ★★★* |
Murakami | 2007 | 8 | ★★★ | ★★ | ★★★* |
Murayama | 2009 | 8 | ★★★ | ★★* | ★★★ |
Nam | 2003 | 6 | ★★★* | ★★ | ★* |
Sasaki | 2014 | 7 | ★★ | ★★ | ★★★* |
Sukawa | 2012 | 7 | ★★★* | ★ | ★★★* |
Xue | 2012 | 6 | ★★★ | ★* | ★★ |
*The score was produced by discussion.