Table 2 Details of study 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 | Enough long follow-up duration | Adequacy of follow-up of cohorts | Total |
|---|---|---|---|---|---|---|---|---|---|---|
Pasanisi [15] | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 7 |
Oh [19] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Calip [17] | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Berrino [16] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 8 |
Fan [20] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
Muniz [21] | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |
Simon [18] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
Grybach [22] | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
Tong [23] | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |