Study | Selection | Comparability of the cohort | Outcome | Total score | |||||
---|---|---|---|---|---|---|---|---|---|
Representativeness of the exposed cohort | Selection of the nonexposed cohort | Ascertainment of exposure | Outcome not present at baseline | Assessment of outcome | Enough follow-up duration | Adequate follow-up | |||
Luo et al. [24] | * | * | * | * | ** | * | * | * | 9 |
* | * | * | * | ** | * | * | * | 9 | |
Marui et al. [26] | * | * | * | * | ** | * | * | * | 9 |
Naito et al. [27] | * | * | * | * | ** | – | * | * | 8 |
Yu et al. [28] | * | * | * | * | ** | * | * | * | 9 |
Zheng et al. [29] | * | * | * | * | ** | * | * | * | 9 |
Li et al. [30] | * | * | * | * | ** | – | * | * | 8 |
Ramanathan et al. [11] | * | * | * | * | ** | * | * | * | 9 |
Nagendran et al. [31] | * | * | * | * | ** | * | * | * | 9 |