Evidence-based practice Study Guide

📖 Core Concepts Evidence‑Based Practice (EBP) – Using scientific evidence as the primary basis for occupational decisions rather than tradition, intuition, or unsystematic experience. Three‑Condition Criteria for a practice to be called evidence‑based: Comparative evidence showing the practice’s effect versus at least one alternative. Preference alignment – evidence must support the practice according to the claimant’s relevant preferences (e.g., patient outcomes, cost). Transparent justification – a sound account explaining the evidence and preferences. Hierarchy of Evidence (most to least reliable): Systematic reviews & meta‑analyses Randomized controlled trials (RCTs) Observational studies Expert opinion / case reports Systematic Review / Meta‑Analysis – A study that aggregates results from multiple primary studies using predefined methods; provides the strongest basis for recommendations. Evidence‑Based Medicine (EBM) – A subset of EBP focused on medical decision‑making, emphasizing well‑designed research. Evidence‑Based Education – Applying the same evidence‑driven logic to policies, programs, and classroom interventions. Metascience – “Science of science”; applies EBP to research itself (e.g., pre‑registration, reporting guidelines). Strength of Evidence Factors – Study design quality and the relevance of endpoints (e.g., survival, quality of life). --- 📌 Must Remember EBP Goal: Replace unsound/outdated practices with those proven effective by research. Three‑Condition Test is mandatory for any claim of being “evidence‑based.” Top‑Tier Evidence = systematic reviews/meta‑analyses or high‑quality RCTs. Weak Recommendations stem from observational or expert‑opinion evidence. Cochrane (1972) championed the need for RCTs; Guyatt (1990/92) coined “evidence‑based medicine.” EBP vs. Tradition: EBP deliberately challenges “it’s always been done this way.” Key endpoints (survival, quality of life) heavily influence evidence strength. --- 🔄 Key Processes Evaluating a Practice for EBP Status Identify comparative studies → assess if they meet the three conditions → synthesize findings → present a transparent justification. Constructing a Hierarchy Rating Gather all available studies → rank each by design (meta‑analysis > RCT > observational > expert) → assign strength level. Developing Evidence‑Based Guidelines Conduct systematic review → grade evidence → formulate recommendations (strong vs. weak) → embed into policy. --- 🔍 Key Comparisons Systematic Review vs. Narrative Review – Systematic: predefined protocol, exhaustive search, reproducible; Narrative: selective, often unsystematic. RCT vs. Observational Study – RCT: random allocation, controls for confounding; Observational: no randomization, higher risk of bias. EBP vs. Tradition – EBP: evidence‑driven, adaptable; Tradition: based on habit, may persist despite contrary data. Metascience vs. Traditional Research – Metascience: studies the research process itself, aims to improve methodology; Traditional: focuses on subject‑matter findings. --- ⚠️ Common Misunderstandings “EBP = only RCTs.” – While RCTs are high quality, systematic reviews/meta‑analyses of any design sit at the top. “If evidence exists, the practice is automatically evidence‑based.” – Must still meet the three‑condition criteria (comparative, preference‑aligned, justified). “Expert opinion is useless.” – It sits low in the hierarchy but can be valuable when higher‑level evidence is absent. “EBP eliminates all uncertainty.” – Evidence always has limits; recommendations can be weak when data are limited. --- 🧠 Mental Models / Intuition “Evidence Pyramid” – Visualize the hierarchy as a pyramid: the tip (smallest) holds the most trustworthy evidence (systematic reviews), the wide base holds plentiful but weaker evidence (observational, expert). “Three‑Gate Filter” – Before calling something evidence‑based, pass it through three mental gates: comparative data, preference fit, clear justification. “Weight‑lifting Analogy” – Strong recommendations are like lifting heavy weights (need strong evidence); weak recommendations are light weights (need lighter evidence). --- 🚩 Exceptions & Edge Cases Rare diseases or ethical constraints – RCTs may be infeasible; high‑quality observational data or expert consensus may be the best available. Cultural/Value Preferences – Even with strong evidence, a practice may be rejected if it conflicts with stakeholder values; the second condition of the three‑condition test addresses this. Rapidly evolving fields – Systematic reviews can become outdated quickly; interim guidance may rely on the latest high‑quality RCTs. --- 📍 When to Use Which Choosing a guideline source: Use systematic review/meta‑analysis when available → strongest recommendation. If none, look for high‑quality RCTs → moderate‑strong recommendation. If still none, consider observational studies → weak recommendation, note limitations. Designing a new intervention: Start with existing systematic reviews to identify proven components. If gaps exist, plan an RCT to generate comparative evidence. Evaluating practice claims: Apply the Three‑Gate Filter; any claim failing a gate is not truly evidence‑based. --- 👀 Patterns to Recognize “Strong recommendation → meta‑analysis or RCT” phrasing in exam stems. “Weak recommendation → observational or expert opinion” language. Presence of “comparative” and “preference‑aligned” language indicates a proper EBP claim. Words like “systematic,” “pre‑registered,” “protocol” signal higher‑level evidence. --- 🗂️ Exam Traps Distractor: “Any study with statistically significant results is evidence‑based.” – Wrong; must meet the three conditions and hierarchy. Distractor: “Expert opinion is sufficient for strong recommendations.” – Incorrect; expert opinion ranks lowest. Near‑miss: “Systematic reviews are always higher quality than RCTs.” – Usually true, but a poorly conducted systematic review can be weaker than a well‑conducted RCT; quality matters. Trap: “Evidence‑based practice ignores values and tradition.” – Misleading; some modern definitions incorporate values and tradition alongside evidence. ---