Table 2 Quality assessment of included cohort studies
Source | Selection | Comparability | Outcome | Scores | |||||
|---|---|---|---|---|---|---|---|---|---|
Author, year | Representativeness of the exposed cohort | Selection of the non exposed cohort | Ascertainment of exposure | Demonstration that outcome was not present at start of study | select the most important factora | Assessment of outcome | Follow-up long enough | Adequacy of follow up of cohorts | |
Aboutaleb,2012 [9] | ā | ā | ā | ā | ā ā | ā | ā | ā | 7 |
Armagan,2015 [10] | ā | ā | ā | ā | ā ā | ā | ā | ā | 6 |
Bozkur,2011 [11] | ā | ā | ā | ā | ā ā | ā | ā | ā | 9 |
Chung,2008 [12] | ā | ā | ā | ā | ā ā | ā | ā | ā | 7 |
Ferroud,2011 [13] | ā | ā | ā | ā | ā ā | ā | ā | ā | 7 |
Hu, 2016 [15] | ā | ā | ā | ā | ā ā | ā | ā | ā | 9 |
Kirac,2013 [16] | ā | ā | ā | ā | ā ā | ā | ā | ā | 9 |
Kruck,2013 [17] | ā | ā | ā | ā | ā ā | ā | ā | ā | 7 |
Ozgor,2016 [19] | ā | ā | ā | ā | ā ā | ā | ā | ā | 7 |
Ozgor, 2018 [20] | ā | ā | ā | ā | ā ā | ā | ā | ā | 7 |
Pan, 2013 [21] | ā | ā | ā | ā | ā ā | ā | ā | ā | 7 |
Sabnis,2012 [22] | ā | ā | ā | ā | ā ā | ā | ā | ā | 7 |
Schoenthaler,2015 [24] | ā | ā | ā | ā | ā ā | ā | ā | ā | 8 |
Wilhelm,2015 [25] | ā | ā | ā | ā | ā ā | ā | ā | ā | 6 |
Zhang,2014 [26] | ā | ā | ā | ā | ā ā | ā | ā | ā | 6 |