Source | Selection | Comparabilitya | Outcome | Total scores |
---|
1 | 2 | 3 | 4 | 5A | 5B | 6 | 7 b | 8 c | Â |
---|
Farvid et al | – | * | * | * | * | * | * | * | * | 8 |
Egeberg et al. | * | * | – | * | * | * | * | * | – | 7 |
Sonestedt et al | * | * | * | * | * | * | * | * | * | 9 |
Nicodemus et al. | * | * | * | * | * | * | * | * | – | 8 |
- 1 Representativeness of the exposed cohort. 2 Selection of the non-exposed cohort. 3 Ascertainment of exposure for cohort studies. 4 Demonstration that outcome of interest was not present at start of study for cohort studies. 5 Comparability of cohorts on the basis of the design or analysis. 6 Assessment of outcome. 7 Was follow-up long enough for outcomes to occur. 8 Adequacy of follow up of cohorts
- aStudies that controlled for age and traditional risk factors received one score, whereas studies that controlled for other important confounders received an additional score
- bstudy with follow-up time > 2 years was assigned one score
- cstudy with follow-up rate > 70% was assigned one score