Table 2 Case–control studies bias assessment using the Newcastle–Ottawa Scale (NOS)
From: Vitamin D and the risk of latent tuberculosis infection: a systematic review and meta-analysis
Study | Selection | Comparability | Exposure | Total score | |||||
|---|---|---|---|---|---|---|---|---|---|
Is the case definition adequate | Representativeness of the cases | Selection of controls | Definition of controls | Comparability of cases and controls of design or analysis | Ascertainment of exposure | Same method of ascertainment for cases | Non-response rate | ||
Maceda 2018 [24] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
Arnedo-Pena 2011 [25] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |