Table 1 Quality assessment of included studies
Author (Reference) | Selection | Comparability | Outcome | Overall score | |||||
|---|---|---|---|---|---|---|---|---|---|
Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at the start of the study | Comparability of cohorts based on the design or analysis | Assessment of outcome | Was follow-up long enough for outcomes to occur | Adequacy of follow-up of cohorts | ||
Sekine [11] | * | * | * | * | ** | * | * | * | 9 |
Cho [13] | * | * | * | ** | * | * | * | 8 | |
de Mooij [14] | * | * | * | * | * | 5 | |||
Wang [15] | * | * | * | ** | * | * | * | 8 | |
de Mooij [16] | * | * | * | ** | * | * | 7 | ||
Umutlu [12] | * | * | ** | * | * | 6 | |||