Checklist for quality assessment
| Item | Criterion | Content | Score |
|---|---|---|---|
| 1 | Aim | A clearly stated aim | 1 |
| 2 | Sample size | >50 persons | 1 |
| 3 | Response rate | >50% | 1 |
| 4 | Length of employment | Information is available | 1 |
| 5 | Control group | A control group was tested | 1 |
| 6 | Confounder | Adjusted for potential confounders | 1 |
| 7 | Limitations | Were discussed | 1 |
| 8 | Laboratory tests | Performance of anti-HCV test or PCR test Performance of confirmatory test | 1 1 |
8–9 scores=high; 5–7 scores=moderate; ≤4 scores=low.
HCV, viral hepatitis C.