Fig. 4From: Methodological quality for systematic reviews of adverse events with surgical interventions: a cross-sectional surveyFactors that may relate to the methodological weaknesses. Notes: The domains with absolute PDs larger than 0.1 (in absolute magnitude) and/or with p-values less than 0.05 were highlighted in bold. The variable development of protocol is exactly the domain 2 in AMSTAR 2.0 instrument. Therefore, we did not compare the rate of “No” for item 2 by this variable. Similarly, domains 11, 12, and 15 were not suitable for qualitative systematic reviews without meta-analysisBack to article page