What levels of evidence are present in relation to research and practice?

What levels of evidence are present in relation to research and practice?

In evidence-based practice, levels of evidence are assigned to studies depending on the methodological quality of the design, validity, and applicability to clinical practice. As outlined by Melnyk and Fineout-Overholt (2015) the rating system for the levels of evidence start from level I to level VII. In particular, Level I encompasses evidence from systematic reviews or meta-analysis from all relevant random controlled trials. Level II is evidence obtained from well-designed random controlled trials. Level II includes evidence from well-designed non-random controlled trials. Level IV involves evidence from well-designed cohort and case-control studies. Level V includes evidence obtained from systematic reviews of qualitative and descriptive studies. Level VI encompasses evidence from qualitative or a single-descriptive study. Lastly, level VII includes evidence from expert committees and authorities’ opinions. 

Save Time On Research and Writing
Hire a Pro to Write You a 100% Plagiarism-Free Paper.
Get My Paper

Why it is important regardless of the method you use?

Notably, evidence-based practice is about finding evidence and applying it to make informed clinical decisions. According to Eyal and Igor (2016), not all evidence is created equal and classifying available evidence using the hierarchical system of classification helps to grade available literature based on the strength of evidence. As a practical application of levels of evidence, for instance, randomized controlled trials are considered high levels of evidence as compared to case reports. The goals of applying evidence-based practice is to choose the most appropriate intervention that is likely to deliver results that consider the best interests of the patient and prevent potential harmful results. In light of this, the strength of the evidence is important despite the method used, alongside the clinical applicability, validity, and relevance of the evidence. Thus, along with using levels of evidence as the basis to assess evidence, it is important to consider significance and applicability.


Eyal, R., & Igor, T. (2016). Classifying scientific evidence as the basis for evidence-based decision making: is strength of evidence absolute?. Evidence-based Endodontics, 1(1), 1-5.Melnyk, B. M., & Fineout-Overholt, E. (2015). Evidence-based practice in nursing & healthcare: A guide to best practice. Philadelphia: Wolters Kluwer.

Place your order
(550 words)

Approximate price: $22

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
The price is based on these factors:
Academic level
Number of pages
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more
Live Chat+1(978) 822-0999EmailWhatsApp

Order your essay today and save 20% with the discount code LEMONADE