Level of evidence in research

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There are seven levels of evidence in research (AKA hierarchy of evidence). A studys methodological quality of their validity, design and application to patient care are what determines the level of evidence. Level 1 is the strongest validated evidence, decreasing to level 5 being the least strongest and valid evidence. Level 1- Evidence obtained from systemic review of randomized controlled trials (RCTs). An example is evidence gathered from multiple clinical drug trials. Level 2- Evidence obtained from a minimum of one well designed RCT. An example is the use of strong study of a clinical drug trial to gain significant evidence. Level 3- Quasi-experimental studies, with evidence from non-randomized controlled trials. An example is implementing a fall prevention protocol,...

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