Table 1 Systematic review case example: helmets for preventing head, brain, and facial injuries in bicyclists
From: Observational evidence and strength of evidence domains: case examples
Strength of evidence factors | Strength of evidence domains |
|---|---|
Required domains | Study limitations: |
• Reduced risk of selection bias: controls from the same population as cases | |
• Reduced risk of detection bias: independent outcome assessors | |
Consistency: consistent direction of effect for the primary outcome observed across multiple studies | |
Precision: precise effect estimate across included studies | |
Additional domains | Strength of association: large magnitude of effect |