Fundamentals of Nursing · Evidence-Based Research, Quality Improvement, and Collaborative Practice

Evidence-Based Research

8 min read

On this page 9 sections

In 30 seconds
Why this matters
The college version
Eli explains
Worked example
Key takeaway
Check yourself
Study tools
Sources & references

In 30 seconds

Evidence-based is the systematic process of producing and evaluating scientific evidence so that nursing care rests on what is actually known to work, rather than on habit, tradition, or a single practitioner's opinion. The idea is not new — Florence Nightingale famously collected and analyzed mortality data during the Crimean War to show that sanitary reforms saved lives — but it became a formal movement in health care in the late 20th century, when landmark national reports drew attention to the toll of preventable errors and unexplained variation in care.

It helps to keep two related ideas separate. Research is systematic inquiry that generates new knowledge (for example, a study testing whether a new dressing improves healing). is the use of the best available evidence, combined with clinical expertise and patient preferences, to make care decisions — a topic developed in the next study guide. Research feeds EBP: without trustworthy studies, there is no evidence to base practice on, and without EBP, research findings never reach the bedside.

Why this matters

Nursing has a long history of "the way we've always done it," but tradition can be wrong — practices have been abandoned when research showed they caused harm or offered no benefit. Evidence-based research matters for four reasons. First, patient safety and outcomes: care grounded in solid evidence produces better, more consistent results. Second, professional accountability: nurses are expected by employers, accreditors, and the public to practice according to current evidence, not personal preference. Third, professional identity: a discipline that generates and uses its own research is a profession, not just a set of tasks. Fourth, exams and practice: questions about levels of evidence, questions, and the difference between research and EBP are staples of nursing licensure exams and clinical practice.

The college version

Core Concepts

Levels of evidence: the evidence pyramid

Not all evidence is equally strong. The classic evidence hierarchy ranks study designs by how well they control bias:

Systematic reviews and meta-analyses sit at the top: they pool and synthesize multiple studies, giving the most trustworthy overall answer.
Randomized controlled trials (RCTs) are the strongest single-study design: participants are randomly assigned to an intervention or a comparison group, which balances known and unknown differences between groups.
Quasi-experimental studies test interventions without randomization.
Cohort studies follow groups over time to see who develops an outcome.
Case-control studies compare people with an outcome to people without it, looking backward.
Case series and case reports describe individual experiences.
Expert opinion sits at the bottom — a starting point for questions, not proof.

Two caveats: a higher-level design is not automatically right for every question (you cannot randomize people to smoking), and a well-done lower-level study can be more useful than a poorly done higher-level one.

Primary versus secondary sources

A is the original report of a study by the researchers who conducted it. A secondary source — a systematic review, clinical practice guideline, or textbook chapter — summarizes, interprets, or synthesizes primary sources. For busy clinicians, secondary sources are efficient, but they should be current and produced by a trustworthy process.

The research process

Research follows a recognizable sequence: (1) identify a clinical question, (2) review the existing literature, (3) choose a design that fits the question, (4) obtain ethical approval, (5) collect and analyze data, and (6) disseminate findings, usually through peer-reviewed publication. — evaluation by other experts before publication — is a key quality check, though it does not guarantee a study is flawless.

PICOT: building a searchable question

Good research and good evidence searches start with a well-built question. The PICOT format structures it:

Population: who is the question about?
Intervention: what is being done (treatment, education, assessment approach)?
Comparison: what is it compared with (usual care, another intervention, nothing)?
Outcome: what result matters (fewer falls, less pain, faster healing)?
Time: over what period?

Example: "In hospitalized older adults (P), does hourly rounding (I) compared with on-demand call lights (C) reduce falls (O) during the first 48 hours of admission (T)?"

Ethics in research with human participants

Research involving people is regulated. Studies generally require approval from an before they begin, and participants must give : a clear explanation of purpose, procedures, risks, benefits, and the right to withdraw at any time without penalty. Vulnerable groups (children, people with cognitive impairment, prisoners) receive extra protections. Nursing research follows the same ethical framework as all human-subjects research, and specific requirements vary by country, institution, and study type.

From research to practice

A single study rarely changes practice. Findings need to be appraised for quality, checked for applicability to your patient population, and — ideally — replicated. The step from "evidence exists" to "evidence is used" is where research becomes evidence-based practice, which also requires clinical judgment and the patient's preferences (see the next topic).

Common Confusions

Do Not Confuse	With	The Difference
Research	Evidence-based practice	Research creates new knowledge; EBP applies the best existing knowledge to individual patients
Randomized controlled trial	Systematic review	An RCT is one study; a systematic review combines many studies for a stronger overall answer
Expert opinion	Evidence	Expert opinion sits at the bottom of the hierarchy — it is a starting point, not proof
Correlation	Causation	A study can show two things happen together without proving one causes the other
Peer-reviewed publication	Flawless study	Peer review filters out obvious problems but does not make every finding correct
Evidence exists	Evidence is used in practice	Finding evidence is not the same as implementing it; change requires appraisal, judgment, and buy-in

Eli explains

The same idea, in plain words

Explain it like I’m 10

Evidence-based research is like testing which recipe actually works before you serve it to everyone. Nurses read careful experiments and use the best-proven ways of caring instead of just doing what has always been done. Evidence from many experiments that agree is the most trustworthy, and experiments with people have to be approved and explained to them first.

Worked example

A medical-surgical nurse notices that patients who are repositioned less often seem to develop skin breakdown more frequently, but she is not sure the routine she learned in orientation is the best one. She turns her observation into a PICOT question: "In hospitalized adults at risk for pressure injuries (P), does a structured repositioning schedule with documentation (I) compared with usual repositioning practice (C) reduce the incidence of pressure injuries (O) over the length of stay (T)?"

She searches the literature and finds a recent systematic review of repositioning trials. Appraising it, she checks whether the review searched major databases, whether the included studies were of decent quality, and whether the patients studied resemble her unit's population. She notices the review calls for more research on high-risk subgroups — a limitation. Her facility's shared-governance council then sponsors a local quality-improvement project testing the protocol (with the organization's usual approvals), and the nurse participates in data collection and dissemination. Along the way, the nurse also considers whether any new research involving patient data would require IRB review — an important check before any data collection begins. This walk-through shows the whole chain: curiosity → PICOT → literature → appraisal → application → evaluation.

Key takeaways

Research generates new knowledge; EBP uses best evidence in practice. Knowing the difference is a common exam trap.
Evidence hierarchy (strongest to weakest): systematic reviews/meta-analyses → RCTs → quasi-experimental → cohort → case-control → case series → expert opinion.
An RCT is the strongest single study; a systematic review is the strongest overall answer.
PICOT = Population, Intervention, Comparison, Outcome, Time — use it to build searchable questions.
Primary source = original study; secondary source = synthesis (systematic review, guideline).
Human-subjects research requires IRB approval and informed consent; participation is voluntary and withdrawable.
Peer review is a quality check before publication, not a guarantee of truth.
One study is never enough to change practice — findings must be appraised, replicated, and applied with judgment.

Check yourself

5 review questions from the chapter. Try each one, then open the answer.

What is the difference between research and evidence-based practice?
Show answer
Research is systematic inquiry that generates new knowledge. Evidence-based practice uses the best available research, combined with clinical expertise and patient preferences, to make care decisions. Research produces the evidence; EBP consumes and applies it.
Order these by strength of evidence: expert opinion, RCT, systematic review, cohort study.
Show answer
Strongest to weakest: systematic review (top), RCT, cohort study, expert opinion (bottom).
Build a PICOT question about a clinical problem of your choice and label each part.
Show answer
Any question with all five labeled parts works, e.g., "In hospitalized adults at risk for pressure injuries (P), does a structured repositioning protocol (I) compared with usual care (C) reduce pressure injury incidence (O) during hospitalization (T)?" The point is that each PICOT element is explicit.
What are two ethical requirements for research involving human participants?
Show answer
IRB approval (or equivalent ethics review) before the study begins, and voluntary informed consent from participants, who may withdraw at any time without penalty.
Why is a single study rarely enough to change nursing practice?
Show answer
Single studies can be biased, underpowered, or applicable only to a narrow population. Findings usually need replication, appraisal, and synthesis (e.g., in systematic reviews) before practice changes, and they must be applied with clinical judgment and patient preferences in mind.

Keep learning

Ready to build on this? Continue to the next lesson.

Study tools & related lessonsKey vocabulary · Related

Key vocabulary

Evidence-based practice (EBP): Using the best available research, clinical expertise, and patient preferences to make care decisions
Research: Systematic inquiry that produces new knowledge
Systematic review / meta-analysis: A review that pools and statistically combines multiple studies on one question
Randomized controlled trial (RCT): A study that randomly assigns participants to intervention or comparison groups
Peer review: Evaluation of a study by other experts before publication
Institutional review board (IRB): A committee that reviews research plans to protect human participants
Informed consent: The participant's voluntary, informed agreement to join a study
PICOT: Population, Intervention, Comparison, Outcome, Time — a question-building format
Primary source: The original report of a study

Sources & references

openstax.org — Fundamentals Nursing

This lesson was adapted from the open educational references above; their licenses and attributions are preserved. See Copyright & Licensing.

Educational content only. It is not medical, legal or professional advice. Found an error? Tell us.