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Table 2 AMSTAR, assessing methodological quality of systematic reviews

From: A systematic review of hospital accreditation: the challenges of measuring complex intervention effects

Study Alkhenzian et al. 2011 Matrix group 2010 Flodgren et al. 2011 Brubakk et al.
AMSTAR question Yes, No, Can’t answer, Not applicable  
1. Was an ‘a priori’ design provided? Yes Yes Yes Yes
2. Was there duplicate study selection and data extraction? No No Yes Yes
3. Was a comprehensive literature search performed? Yes Yes Yes Yes
4. Was the status of publication (i.e. grey literature) used in the inclusion criterion? No Yes No No
5. Was a list of studies (included and excluded) provided? Yes, although only for the included Yes, although only for the included Yes, both included and excluded studies Yes, both included and excluded studies
6. Were the characteristics of the included studies provided? Yes Yes Yes Yes
7. Was the scientific quality of the included studies assessed and documented? Yes Yes, No Yes Yes
8. Was the scientific quality of the included studies used appropriately in formulating conclusions? No Can’t answer Yes Yes
9. Were the methods used to combine the findings of studies appropriate? Not applicable (N/A) Yes Not applicable (N/A) Not applicable (N/A)
10. Was the likelihood of publication bias assessed? No No Yes Yes
11. Was the conflict of interest stated? No No Yes Yes
  1. AMSTAR. Assessing Methodological Quality of Systematic Review, quality assessment of included systematic reviews categorized by yes, no, cannot answer, not applicable