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Quality assessment of included case-control studies using the NIH quality assessment tool
| Author, year | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Quality rating |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wang et al., 2018 | Yes | Yes | No | Yes | Yes | Yes | NR | Yes | No | Yes | NA | Yes | Fair |
NIH: National Institute of Health, NA: not applicable, NR: not reported
