First author, year | Representativeness of exposed cohort | Selection of unexposed cohort | Ascertainment of exposure | Outcome of interest not present at start of study | Comparability based on the design or analysis | Ascertainment of outcome | Follow-up long enough for outcomes to occur | Adequacy of followup | Total quality scores |
---|---|---|---|---|---|---|---|---|---|
Saku, 1995 [7] | * | – | * | * | * | * | * | – | 6 |
Perini, 2014 [8] | * | – | * | * | * | * | * | – | 6 |
Tran, 2009 [9] | * | – | * | * | * | * | * | – | 6 |
Olfson, 2015 [10] | * | – | * | * | * | * | * | * | 7 |
Brown, 2010 [22] | * | – | * | * | * | * | * | – | 6 |
Kredentser, 2014 [23] | * | – | * | * | * | * | * | – | 6 |
Crump, 2013 [24] | * | * | * | * | * | * | * | – | 7 |