Open Access
Review
Table 1
Newcastle-Ottawa Scale (NOS) for assessing the quality of observational studies.
| Study | Selection |
Comparability |
Exposure |
Total |
|||||
|---|---|---|---|---|---|---|---|---|---|
| Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | Comparability of cohorts based on the design or analysis | Assessment of outcome | Was follow-up long enough for outcomes to occur | Adequacy of follow up of cohorts | Total number of stars | |
| Tan et al. [22] | * | * | * | * | * | * | * | * | 8 |
| Siddharth et al. [21] | * | * | * | * | * | * | * | * | 8 |
| Biazzo et al. [23] | * | * | – | * | ** | * | * | * | 8 |
| Chung and Min 27 | * | * | * | * | * | * | * | * | 8 |
| Parratte et al. [16] | * | * | - | * | * | * | * | * | 7 |
| Confalonieri et al. [32] | – | * | * | * | * | * | * | * | 7 |
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