Study | Year | Selection | Comparability | Outcome | Quality score | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | Comparability of cohorts on the basis of the design or analysis | Comparability of cohorts on the basis of the measurement | Assessment of outcome | Was follow-up long enough for outcomes to occur | Adequacy of follow-up of cohorts | |||
Fu et al | 2011 | - | ☆ | ★ | - | ★ | ★ | - | ★ | ★ | 5.5 |
Dai et al | 2017 | - | ☆ | ★ | - | ★ | ★ | ★ | ★ | ★ | 6.5 |
Rai et al | 2017 | - | ☆ | ★ | - | ★ | ★ | - | ★ | - | 4.5 |
Zhang et al | 2018 | - | ☆ | ★ | - | ★ | ★ | - | ★ | ★ | 5.5 |