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Newcastle ottawa quality assessment scale.
| Study | Representativeness of exposed | Selection of non exposed | Ascertainment of exposure | Outcome of interests not present at time of exposure | Comparability | Assessment of outcome | Follow up long enough for outcome to happen | Adequacy of f/u | Total |
|---|---|---|---|---|---|---|---|---|---|
| S. Hillerup, 2008 | * | * | * | * | * | * | 6 | ||
| PETER G., 1984 | * | * | * | * | * | 5 | |||
| Tuncer Ozen, 2006 | * | * | * | * | 4 |
