Table 1 NOS score of study
Study | 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 outcomes to occur | Adequacy of follow up of cohorts | Quality score |
|---|---|---|---|---|---|---|---|---|---|
Wang 2014 [25] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Fukuchi 2015 [24] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Ito 2015 [23] | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
Kinoshita 2015 [22] | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
Li 2015 [21] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
Sato 2017 [8]Â | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 7 |
Yamada 2016 [20] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Fukuchi 2018 [19] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Ohnuma 2021 [7] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 7 |
Li 2021 [18] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Shinkai 2022 [16] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Liang 2023 [15] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |