Table 2 Results of quality assessment using the Newcastle-Ottawa scale quality for cohort studies
Newcastle-Ottawa scale | Selection (1) | Comparability (2) | Outcome (3) | 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 | Comparability of cohorts on the basis of the design or analysis | Assessment of outcome | Was follow-up long enough for outcome to occur? | Adequacy of follow-up of cohorts | ||
Laursen 2021 [23] | ☆ | ☆ | ☆ | ☆ | ☆☆ | ☆ | – | ☆ | 8 |
Johnson 2021 [17] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | – | ☆ | 7 |
Ferguson 2021 [22] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | – | ☆ | 7 |
Schwartz 2021 [21] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | – | ☆ | 7 |
R.L Johnson 2018 [20] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | – | ☆ | 7 |
Mclsaac D. I 2016 [19] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | – | ☆ | 7 |
Mclsaac 2016 [18] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | – | ☆ | 7 |
R.L Johnson 2021 [24] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | – | ☆ | 7 |
Runner 2017 [25] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | – | ☆ | 7 |
Shin 2016 [26] | ☆ | ☆ | ☆ | ☆ | ☆☆ | ☆ | – | ☆ | 8 |
Sophia 2018 [27] | ☆ | ☆ | ☆ | ☆ | ☆☆ | ☆ | – | ☆ | 8 |
Traven 2019 [28] | ☆ | ☆ | ☆ | ☆ | ☆ | ☆ | – | ☆ | 7 |