Final answer:
The four main sources of evidence used in EBP are randomized controlled trials, systematic reviews, meta-analyses, and observational studies.
Step-by-step explanation:
Main Sources of Evidence in EBP:
Randomized controlled trials: These studies involve randomly assigning participants to different groups to compare the effects of an intervention.
Systematic reviews: These studies analyze and synthesize the findings from multiple studies on a specific topic.
Meta-analyses: These studies statistically combine the results of multiple studies to provide a more precise estimate of the treatment effect.
Observational studies: These studies observe individuals or groups to determine the relationship between exposures and outcomes.