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The Walden Library’s “Levels of Evidence” webpage provides information on different types of resources that can be used for evidence-based practice. This webpage categorizes the resources in different levels of evidence. They range from Level I which contains systematic reviews and metaanalyses to Level VII which includes expert opinions and anecdotal proof.
The webpage lists relevant databases for each level of evidence. This allows you to find resources by searching the database. The databases can be used to search for both filtered or unfiltered resources.
Filtered resources include those which have been reviewed by professionals in their field for relevance and quality. They are usually found in databases that focus on a specific subject such as PubMed, CINAHL or CINAHL. For high-quality and relevant information, filtered resources are very helpful.
These resources are not filtered and have no quality control or relevancy. You can find these resources in both general search engines like Google and Bing as well as databases that are not specialized in one subject. Although non-filtered sources can provide a good overview, they are not always accurate or useful.
When conducting evidence-based research, it is crucial to make use of both filtered and unfiltered sources. Researchers can have a broad understanding of the topic and still use relevant, high-quality information for their research.