Efficacy paradox and proportional contextual effect (PCE).

Area of Science:

• Clinical trial methodology
• Evidence-based medicine
• Health services research

Background:

• The "efficacy paradox" describes the discrepancy between treatment effects observed in randomized controlled trials (RCTs) and those seen in clinical practice.
• This difference arises from how treatment benefits are assessed: RCTs focus on specific treatment effects versus placebo, while clinical practice considers overall treatment effects, including contextual responses.

Purpose of the Study:

• To explain the causes and implications of the efficacy paradox.
• To propose a modification in RCT reporting to reduce this paradox and better align guidelines with clinical reality.

Main Methods:

• Discussion of the conceptual differences between specific treatment effects (RCTs) and overall treatment effects (clinical practice).
• Analysis of how current RCT reporting contributes to the efficacy paradox.
• Proposal for altering RCT reporting to emphasize overall treatment benefit and the proportional contextual effect.

Main Results:

• The efficacy paradox creates a disconnect between clinical guidelines and actual patient experiences.
• Current RCT reporting methods, focusing on specific treatment effects, overlook the significant contribution of contextual and placebo responses.
• A shift in RCT reporting towards overall treatment benefit and proportional contextual effects could mitigate this paradox.

Conclusions:

• The efficacy paradox highlights a critical gap in translating research findings into effective clinical care.
• Addressing the efficacy paradox requires acknowledging and quantifying contextual effects alongside specific treatment effects.
• Reforming RCT reporting standards is crucial for improving the applicability of evidence-based medicine in real-world settings.