Table 3 Cohort 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 | Assessment of outcome | Total score | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Representativeness of exposure arm(s) | Selection of the comparative arm(s) | Origin of exposure source | Demonstration that outcome of interest was not present at start of study | Studies controlling the most important factors | Studies controlling the other main factors | Assessment of outcome with independency | Adequacy of follow-up length | Lost to follow-up acceptable | ||
Arnedo-Pena 2020 [17] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 8 |
Arnedo-Pena 2015 [16] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 7 |
Verrall 2017 [26] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |