Many sources provide evidence to support a conclusion, but some evidence is better than others. Check out the links below to learn about levels of evidence.
Writing a PICOT question will help focus your search for evidence-based sources.
I-Intervention or Issue of interest
C-Comparison intervention or group
Strong PICOT question: In teenagers, how does cognitive-behavioral skills building compared to yoga affect anxiety after 6 weeks of treatment?
Poorly designed question: What is the best type of intervention to use with teenagers who are anxious?
(Examples from Evidence-based Practice in Nursing & Healthcare: A Guide to Best Practice, 2nd ed., by Melnyk and Fineout-Overholt.)