Study | Design | Selection | Comparability | Outcome | Total | |||||
---|---|---|---|---|---|---|---|---|---|---|
Representativeness of exposed cohort | Selective of nonexposed Cohort | Ascertainment of exposure | Outcome not present at start | Assessment of outcome | Adequate follow-up length | Adequacy of follow-up | ||||
Croome | P | * | * | * | * | * | * | * | 7 | |
Speicher | R | * | * | * | * | * | * | * | 7 | |
Sharpe | R | * | * | * | * | * | * | 6 | ||
Stauffer | P | * | * | * | * | * | * | * | * | 8 |
Champman | R | * | * | * | * | * | * | * | * | 8 |
Kantor | R | * | * | * | * | * | * | * | * | 8 |
Chen | R | * | * | * | * | * | * | * | * | 8 |
Dokmak | P | * | * | * | * | * | * | * | 7 |