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Quality assessment of included perspective cohort studies.
| Author, year | Selection | Comparability | Outcome | Overall quality | |||||
|---|---|---|---|---|---|---|---|---|---|
| Representative of exposed cohort | Selection of controls | Exposure ascertainment | No history of disease | Comparable on confounders | Outcome assessment | Adequate follow-up time (>5 years) | Follow-up rate (>80%) | ||
| Fumeron et al., 2011 | 0 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 7 |
| Liu et al., 2005 | 0 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 7 |
