Skip to main content

Table 4 Quality assessment using Newcastle-Ottawa Scale for case control studiesa

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

Study Selection Comparability Exposure Study score
case definition adequate Representativeness of the cases Selection of Controls Definition of Controls study controls for important factors study controls for other factors Assessment of exposure Same method of ascertainment for cases and controls Non-Response rate
Costa FO, et al., 2013 [37] *   *   * * * *   6/9
Frias-Bulhosa, et al. 2018 [28] *    *    * *   4/9
Shamala, et al. 2017 [27] *       * *   3/9
  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