Table 2 Newcastle–Ottawa Scale for quality assessment of studies included in this meta-analysis
Study | Representativeness sample | Size sample | Source of information | Demonstration that outcome was not present at study start | Control variable confusion | Assessment outcome | Enough follow up period | Newcastle Ottawa Scale Score |
|---|---|---|---|---|---|---|---|---|
Tuon et al. 2010 [18] | ★ | ★ | ★ | ★ | ★ | 5/7 | ||
Moon et al. 2013 [15] | ★ | ★ | ★ | ★ | ★ | 5/7 | ||
Wang et al. 2014 [19] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 7/7 |
Debonis et al. 2016 [13] | ★ | ★ | ★ | ★ | ★ | 5/7 | ||
Fotakopoulos et al. 2016 [14] | ★ | ★ | ★ | ★ | ★ | 5/7 | ||
Shofty et al. 2016 [17] | ★ | ★ | ★ | ★ | ★ | 5/7 | ||
Chusri et al. 2017 [12] | ★ | ★ | ★ | ★ | ★ | 5/7 | ||
Rodriguez-Guardado et al. 2008 [16] | ★ | ★ | ★ | ★ | ★ | 5/7 |