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Always consider: RCTs CCTs. Systematic review question ( including PICOS). Are their gaps in the trial evidence?. Yes. No. Confine review to RCTs/CCTs. Consider OS. Will OS provide valid and useful information?. Assess the suitability of OS: Natural history of the disease
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Always consider: RCTs CCTs Systematic review question (including PICOS) Are their gaps in the trial evidence? Yes No Confine review to RCTs/CCTs Consider OS Will OS provide valid and useful information? Assess the suitability of OS: Natural history of the disease or exposure Potential biases Assess whether OS address the review question Refocus the review question on gaps