Table 1 Newcastle–Ottawa quality assessments scale
Studies | Year | Quality indicators from Newcastle–Ottawa Scale | Scores | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |||
Chou [20] | 2018 | ★ | – | ★ | ★ | ★ | ★ | ★ | ★ | 7 |
Lu [10] | 2017 | ★ | ★ | ★ | ★ | ★★ | ★ | – | ★ | 8 |
Huang [4] | 2017 | ★ | ★ | ★ | ★ | ★ | ★ | – | ★ | 7 |
Li [11] | 2017 | ★ | ★ | ★ | ★ | ★★ | ★ | – | – | 7 |
Shimura [41] | 2017 | ★ | ★ | ★ | ★ | ★★ | ★ | – | ★ | 8 |
Wang [49] | 2017 | ★ | ★ | ★ | ★ | ★ | ★ | – | ★ | 7 |
Liu [37] | 2017 | ★ | ★ | ★ | ★ | ★★ | ★ | – | – | 7 |
Gopalan [21] | 2016 | ★ | ★ | ★ | ★ | ★★ | ★ | – | ★ | 8 |
Ilmer [12] | 2016 | ★ | ★ | – | ★ | ★★ | ★ | – | ★ | 7 |
Yang [48] | 2016 | ★ | ★ | ★ | ★ | ★★ | ★ | – | ★ | 8 |
Tas [36] | 2016 | ★ | – | ★ | ★★ | ★ | – | ★ | 7 | |
Cheng [40] | 2015 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | – | 7 |
Lu [47] | 2015 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | – | 8 |
Jiang [22] | 2014 | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
Gomes [23] | 2014 | ★ | – | ★ | ★ | ★★ | ★ | ★ | ★ | 8 |
Mu [44] | 2013 | ★ | ★ | ★ | ★ | ★ | ★ | – | ★ | 7 |
Wu [45] | 2013 | ★ | ★ | ★ | ★ | ★★ | ★ | – | – | 7 |
Liu [46] | 2013 | ★ | – | ★ | ★ | ★ | ★ | – | ★ | 6 |
Yamaki [24] | 2012 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | – | 8 |
Yang [25] | 2012 | ★ | – | ★ | ★ | ★ | – | – | ★ | 5 |
Kim [26] | 2012 | ★ | ★ | ★ | ★ | ★★ | ★ | – | – | 7 |
Kosacka [38] | 2011 | ★ | ★ | – | – | ★★ | ★ | ★ | – | 6 |
Povegliano [27] | 2010 | ★ | ★ | ★ | ★ | ★ | ★ | – | ★ | 7 |
Canesin [42] | 2010 | ★ | – | ★ | – | ★★ | ★ | – | ★ | 6 |
Vereecken [43] | 2009 | ★ | ★ | ★ | – | ★ | ★ | – | ★ | 6 |
Miranda [28] | 2009 | ★ | – | – | ★ | ★★ | ★ | ★ | – | 6 |
Szoke [29] | 2007 | ★ | – | – | ★ | ★ | ★ | – | ★ | 5 |
Kang [30] | 2007 | ★ | ★ | ★ | ★ | ★ | ★ | ★ | – | 7 |
Moisa [39] | 2007 | ★ | ★ | – | ★ | ★ | – | ★ | ★ | 6 |
Okada [13] | 2006 | ★ | ★ | ★ | ★ | ★ | ★ | – | ★ | 7 |
Plzak [31] | 2004 | ★ | ★ | ★ | – | ★ | – | ★ | – | 5 |
Piantelli [14] | 2002 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | – | 8 |
Brule [32] | 2000 | ★ | – | ★ | ★ | ★ | ★ | ★ | – | 6 |
Honjo [33] | 2001 | ★ | ★ | ★ | – | ★ | ★ | ★ | – | 6 |
Nakamura [34] | 1999 | ★ | ★ | ★ | ★ | ★★ | ★ | – | ★ | 8 |
Sanjuan [35] | 1997 | ★ | – | ★ | – | ★ | ★ | – | – | 4 |