Search filters are standardized strategies that help identify higher quality literature within many of the medical databases. They are very useful for narrowing a search to high quality study designs but can also be used for other topics or age groups.
To incorporate a search filter into a search strategy, use AND to combine the final set of subject search with the final set of the filter.
Medline (OVID Version)
("Clinical Trial"[Publication Type] OR groups[Title/Abstract] OR placebo*[Title/Abstract] OR trial*[Title/Abstract] OR random*[Title/Abstract] OR "drug therapy"[Subheading]) NOT ((animals[MeSH Terms]) NOT ((animals[MeSH Terms]) AND (humans[MeSH Terms])))
EMBASE (OVID Version) - NOT VALIDATED
CINAHL (EBSCO Version) ♦
( (MH "Random Assignment") or (MH "Random Sample+") or (MH "Crossover Design") or (MH "Clinical Trials+") or (MH "Comparative Studies") or (MH "Control (Research)+") or (MH "Control Group") or (MH "Factorial Design") or (MH "Quasi-Experimental Studies+") or (MH "Placebos") or (MH "Meta Analysis") or (MH "Sample Size") or (MH "Research, Nursing") or (MH "Research Question") or (MH "Research Methodology+") or (MH "Evaluation Research+") or (MH "Concurrent Prospective Studies") or (MH "Prospective Studies") or (MH "Nursing Practice, Research-Based") or (MH "Solomon Four-Group Design") or (MH "One-Shot Case Study") or (MH "Pretest-Posttest Design+") or (MH "Static Group Comparison") or (MH "Study Design") or (MH "Clinical Research+") ) or ( clinical nursing research or random* or cross?over or placebo* or control* or factorial or sham* or meta?analy* or systematic review* or blind* or mask* or trial* )
Web of Science ♦ - NOT VALIDATED
TS= clinical trial* OR TS=research design OR TS=comparative stud* OR TS=evaluation stud* OR TS=controlled trial* OR TS=follow-up stud* OR TS=prospective stud* OR TS=random* OR TS=placebo* OR TS=(single blind*) OR TS=(double blind*)
♦ Search filter can be cut and paste directly into the Advanced Search box of the database