The Evidence-based practice limiter is applied to articles from evidence based practice journals, as well as articles about evidence based practice, research articles (including systematic reviews, clinical trials, meta analyses, qualitative studies), commentaries on research studies (applying practice to research), case studies if they meet the criteria of the use of research and/or evidence based practice terms.
From EBSCO's press release:
Clinical Queries, designed for clinician use, allow users to limit searches with specific search strategies, to aid in retrieving scientifically sound and clinically relevant study reports indexed in CINAHL databases. Searches can be refined using specific search strategies designed to produce results in five research areas:
As research may require different emphasis, three strategies are provided for each area.