Table 4 Quality of Included Studies, Using the Newcastle-Ottawa Quality Assessment Scale for Case Control Studies.
Studies | Selection | Comparability | Exposure | Quality score (Number of stars) | |||||
|---|---|---|---|---|---|---|---|---|---|
Is the case definition adequate | Representativeness of the cases | Selection of Controls | Definition of Controls | Comparability of cases and controls on the basis of the design or analysis | Ascertainment of exposure | Same method of ascertainment for cases and controls | Non - Response rate | ||
Bly19 | * | * | * | * | * | * | * | * | 8 |
