Critical Appraisal: Appraising a Systematic Review Migraine – Methodology Design – Question 2

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• Focused question,Methodology described,Primary studies selected according to a predefined criteria,Quality of primary studies assessed using predefined criteria,Synthesis of primary data may be assisted with formal statistical tests,Bias in selection of studies formally assessed
• Broad question,No methodology described,Primary studies selected at the author's discretion,Quality of primary studies assessed by author,No statistical testing of primary data,Conclusions result from a scientific study of available data,Conclusions result from author's interpretation of studies