Study | Selection | Comparability | Outcome | Quality | |||||
---|---|---|---|---|---|---|---|---|---|
Representativeness of exposed | Selection of non-exposed | Ascertainment of exposure | Assessment of outcomes at study commencement | Comparability of cohorts | Assessment of outcome | Follow-up duration long enough (> 3 m) | Follow up of cohort is adequate (> 80%) | ||
[32] | * | 0 | * | * | ** | * | * | * | Good |
[24] | * | 0 | * | * | ** | * | * | 0 | Good |
[25] | * | 0 | * | * | ** | * | * | * | Good |
[35] | * | * | * | 0 | ** | * | 0 | * | Good |
[26] | * | 0 | * | * | ** | * | * | 0 | Good |
[27] | * | 0 | * | * | * | * | * | 0 | Good |
[19] | * | 0 | * | * | ** | * | * | 0 | Good |
[36] | * | 0 | * | * | ** | * | * | 0 | Good |
[20] | * | 0 | * | * | ** | * | * | 0 | Good |
[37] | * | * | * | 0 | ** | * | * | 0 | Good |
[39] | * | 0 | * | * | ** | * | 0 | * | Good |
[27] | * | * | * | * | ** | * | * | * | Good |
[33] | 0 | 0 | * | * | ** | * | * | 0 | Fair |
[29] | * | * | * | * | ** | * | * | * | Good |
[30] | * | 0 | * | 0 | ** | * | * | * | Fair |
[34] | * | * | * | 0 | ** | * | 0 | * | Good |
[21] | * | 0 | * | * | ** | * | 0 | * | Good |
[17] | * | 0 | * | * | ** | * | 0 | * | Good |
[30] | * | 0 | * | * | ** | * | 0 | * | Good |
[22] | 0 | 0 | * | * | ** | * | * | 0 | Fair |
[16] | * | * | * | * | * | * | * | 0 | Good |
[18] | * | 0 | * | * | ** | * | * | 0 | Good |
[23] | * | 0 | * | * | ** | * | * | * | Good |
[31] | * | 0 | * | * | ** | * | * | * | Good |
[40] | * | 0 | * | * | ** | * | 0 | 0 | Poor |
[41] | * | * | * | * | * | * | * | * | Good |