Table 2 NOS scores of each item in the included studies
General items | Case–control study (n = 10) | Cohort study (n = 2) | ||
|---|---|---|---|---|
Detailed items | Score (%) | Detailed items | Score (%) | |
Selection | 1) Is the Case Definition Adequate? | 8 (80.00) | 1) Representativeness of the Exposed Cohort | 2 (100.00) |
2) Representativeness of the Cases | 3 (30.00) | 2) Representativeness of the Non-Exposed Cohort | 2 (100.00) | |
3) Selection of Controls | 7 (70.00) | 3) Ascertainment of Exposure | 2 (100.00) | |
4) Definition of Controls | 8 (80.00) | 4) Demonstration That Outcome of Interest Was Not Present at Start of Study | 2 (100.00) | |
Comparability | Comparability of Cases and Controls on the Basis of the Design or Analysis | 19 (95.00) | Comparability of Cohorts on the Basis of the Design or Analysis | 4 (100.00) |
Exposure | 1) Ascertainment of Exposure or Blinding | 5 (50.00) | 1) Assessment of Outcome | 2 (100.00) |
2) Same Method of Ascertainment for Cases and Controls | 10 (100.00) | 2) Was Follow-Up Long Enough for Outcomes to Occur | 2 (100.00) | |
3) Non-Response Rate | 0 (0.00) | 3) Adequacy of Follow Up of Cohorts | 2 (100.00) | |
Total score | 60 (66.67) | 18 (100.00) | ||