Table 2.
Groups well defined | Selection bias | Exposure | Outcome | Blinding | Follow-up | Loss to follow up | Confounding | Generalizability | |
---|---|---|---|---|---|---|---|---|---|
Angeli 1996 [20] 6/9 |
+ | - | + | + | - | + | + | - | + |
Baskol 2004 [21] 6/9 |
+ | + | + | + | - | ? | ? | + | + |
Garrison 2015 [22] 9/9 |
+ | + | + | + | + | + | + | + | + |
Garrison 2012 [2] 6/9 |
+ | - | - | + | + | + | + | - | + |
Hawke 2013 [4] 9/9 |
+ | + | + | + | + | + | + | + | + |
Hawke 2013 [23] 9/9 |
+ | + | + | + | + | + | + | + | + |
Hirai 2000 [24] 4/9 |
+ | - | + | + | - | ? | ? | - | + |
Naylor 1994 [25] 5/9 |
+ | + | + | - | + | ? | ? | ? | + |
Nishant 2014 [26] 5/9 |
+ | - | + | + | - | + | - | - | + |
Oboler 1991 [27] 4/9 |
+ | - | + | + | - | ? | ? | - | + |