Table 2.
The Newcastle-Ottawa quality assessment in retrospective studies.
| Study (year) | Selection | Comparability | Outcome/exposure |
|---|---|---|---|
| Itoi (2009) | ∗∗∗∗ | ∗∗ | ∗∗ |
| Hong GY (2009) | ∗∗∗ | N/A | ∗∗ |
| Kim TH (2011) | ∗∗∗∗ | ∗∗ | ∗∗ |
| Rosa (2013) | ∗∗∗∗ | ∗∗ | ∗∗ |
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