Table 6.
Study | Selection | Comparability | Outcome | Total/9 | ||||||
---|---|---|---|---|---|---|---|---|---|---|
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 | Controls for most important factor | Controls for any additional factor | Assessment of outcome | Was follow-up long enough for outcomes to occur | Adequacy of follow up of cohorts | ||
Hack 2019 | – | – | – | ★ | ★ | ★ | ★ | ★ | ★ | 6 |
Ljungberg 2016 | – | – | – | ★ | ★ | ★ | ★ | ★ | ★ | 6 |
Wilson 2015 | – | – | – | ★ | ★ | ★ | ★ | ★ | ★ | 6 |
Yeung 2014 | – | – | – | ★ | – | – | ★ | ★ | – | 3 |
Zahodne 2014 | – | – | ★ | – | ★ | ★ | ★ | ★ | – | 5 |
A maximum of 9 stars can be given to each study