Quality assessment; observational studies—cohort studies
| Author | Selection | Comparability | Outcome | |||||
|---|---|---|---|---|---|---|---|---|
| Representativeness of exposed cohort | Selection of non-exposed cohort | Ascertainment of exposure | Outcome of interest not present at start of study | Assessment | Follow up: outcomes | Follow up: cohorts | ||
| Burrows | * | * | * | * | ||||
| Wilkinson | * | * | * | * | * | |||