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Table 2 Quality assessment for cross-sectional study

From: Significant association between vitamin D deficiency and sepsis: a systematic review and meta-analysis

Study (Year) Selection Comparability Outcome Total
Representativeness of the sample Justified sample size Ascertainment of exposure Comparable non-respondents rate between two groups Comparability of different samples on the basis of the design or analysis Assessment of outcome Appropriate statistical test
truly representative somewhat representative Validated measurement tool Non-validated tool study controls for important factor study controls for any additional factor independent blind assessment record linkage
Jeng 2009     **    * * **   * 7
Muller 2000   *   **      **   * 6
Su 2013   *   **      **   * 6