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Table 3 Quality assessment using Newcastle-Ottawa Scale for cohort studiesa

From: Association between type 2 diabetes (T2D) and tooth loss: a systematic review and meta-analysis

Study Selection Comparability Outcome Study score
Representativeness of The exposed cohort Selection of the non-Exposed cohort Ascertainment of exposure Demonstration that the outcome of interest was not present at start of the study Comparability of Cohorts on the basis of design or analysis Assessment of outcome Was follow- up
Long enough
For the outcome to occur?
Adequacy of follow up of cohorts
Yoo, et al., 2019 * * * *   * * * 7/9
Joshipura, et al. 2018 * * *    * * * 6/9
Oluwagbemigun, et al. 2015 * * * * * * *   7/9
Liljestrand, et al. 2015 * * *    * * * 6/9
Greenblatt, et al. 2016 * * * *   * * * 7/9
Zhang, et al. 2021 * * * * * * * * 8/9
  1. aStudy score less than 4 indicates low quality, a score of 4 to 6 represents poor to moderate, and a score 7 or higher indicates as a good quality