Skip to main content

Table 2 Newcastle-Ottawa Scale for quality assessment

From: Clinicopathological and prognostic significance of PD-L1 expression in colorectal cancer: a systematic review and meta-analysis

Author, year Selection Comparability Outcome Total score
Exposed cohort Non-exposed cohort Ascertainment of exposure Outcome of interest Control for factor Assessment of outcome Follow-up long enough Adequacy of follow-up
Enkhbat, 2018 [15] * * *   **   * * 7
Masugi, 2016 [35] * * *   **   * * 7
Saigusa, 2016 [16] * * *   **   * * 7
Zhu, 2015 [36] * * *   **   * * 7
Liang, 2014 [17] * * * * **   * * 8
Droeser, 2014 [37] * * *   **   * * 7
Hamada, 2017 [20] * * *   **   * * 7
Lee, 2018 [18] * * *   **   * * 7
Li, 2016 [19] * * *   **   * * 7
Miller, 2017 [38] * * *   **   * * 7
  1. *The article scored one point in the project
  2. **The article scored two points in the project