Table 2 Details of quality evaluation via the Newcastle–Ottawa Scale
Study | Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Outcome not present at baseline | Control for age | Control for other confounding factors | Assessment of outcome | Sufficient follow-up duration | Adequacy of follow-up of cohorts | Total |
|---|---|---|---|---|---|---|---|---|---|---|
Sanchez-Inigo [19] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Salazar [20] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Su [21] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Li [18] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Hong [23] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Park [24] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Barzegar [22] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Tian [25] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |