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Which of the following is the lowest level of “best evidence” for evidence-based practice?

A.

Clinical experiences

B.

Opinions of experts

C.

Client values and preferences

D.

Trial and error

Answer and Explanation

The Correct Answer is B

Evidence-based practice (EBP) uses a hierarchy of evidence to guide clinical decision-making. This hierarchy ranks sources of knowledge from the most reliable (such as systematic reviews of randomized controlled trials) to the least reliable.

Rationale for correct answer:

D. Trial and error: This is not considered valid evidence in evidence-based practice because it lacks systematic methodology, reproducibility, and scientific rigor. Decisions based on trial and error are often anecdotal and not grounded in validated research.

Rationale for incorrect answers:

A. Clinical experiences: While personal clinical experiences are important, they are still grounded in observation and practice. They may be biased, but they are often more applicable than trial and error.

B. Opinions of experts: Expert opinion is valuable, but it lacks the rigorous testing and validation of research. It’s based on experience rather than systematic investigation.

C. Client values and preferences: While subjective, client values are essential in shared decision-making. They do not rank in the evidence hierarchy itself but are considered alongside best evidence.

Take-home points:

  • The strongest evidence comes from well-designed research, but patient values and clinical judgment remain essential in applying it.


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Related Questions

Correct Answer is D

Explanation

PICO is a mnemonic used to build focused clinical questions for evidence-based practice: Patient/Population/Problem, Intervention, Comparison, Outcome.

Rationale for correct answer:

D. Explicit descriptions of population of interest: P refers to the patient group or problem (e.g., adults with type 2 diabetes, postoperative hip fracture patients).

Rationale for incorrect answers:

A. Comparison to another similar treatment: That describes C (Comparison), not P.

B. Clearly defined, focused literature review: A literature review is a research activity, not the P element of PICO.

C. Specific identification of the desired outcome: That is O (Outcome), not P.

Take home points:

  • A research critique is a balanced appraisal of strengths and weaknesses that informs evidence-based decisions.
  • Use the critique to determine trustworthiness and clinical applicability, not just to summarize the article

Correct Answer is A

Explanation

Quantitative research focuses on measurable variables and numerical data to establish patterns, relationships, and cause-effect links. It is particularly useful when researchers want to test hypotheses or determine the impact of an intervention.

Rationale for correct answer:

A. A study measuring the effects of sleep deprivation on wound healing: This involves measurable outcomes (e.g., wound size, healing time) and seeks statistical analysis, making it ideal for quantitative research.

Rationale for incorrect answers:

B. A study examining the bereavement process in spouses of clients with terminal cancer: This involves exploring personal experiences, emotions, and meanings, which fits qualitative research.

C. A study exploring factors influencing weight control behavior: While some parts could be measured, “exploring factors” often implies a qualitative approach to understand motivations and barriers.

D. A study examining a client’s feelings before and after a bone marrow aspiration: This involves subjective feelings and personal perception, which are typically analyzed using qualitative methods.

Take home points:

  • Quantitative research answers “how much” or “how many” using numbers and measurable outcomes.
  • Qualitative research explores meanings, experiences, and perceptions, often without statistical measurement.

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