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Pragmatic vs Explanatory Trials: A Quantitative Analysis

Keywords

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What are Pragmatic Trials?

Pragmatic trials are designed to test interventions in real-world conditions, focusing on:

Key Differences at a Glance

Metric Pragmatic Trials (e.g., RECOVERY) Traditional Explanatory Trials
Cost per Trial Lower due to existing infrastructure $48-225 million
Time to Results Weeks to months 5-7 years average
Participants Large (e.g., 47,000+ in RECOVERY) Typically 500-3000
Implementation Speed Hours to days Months to years
Patient Population Diverse, real-world Highly selected
Setting Routine clinical practice Specialized research centers
Generalizability High Limited

Side-by-side comparison illustrating the structural differences in cost, speed, and scale between pragmatic and traditional explanatory trials.

Side-by-side comparison illustrating the structural differences in cost, speed, and scale between pragmatic and traditional explanatory trials.

Cost Analysis

Traditional Explanatory Trials

A bar chart comparing average costs across clinical trial phases and a comparison of per-patient costs between specific therapeutic areas and the general average.

A bar chart comparing average costs across clinical trial phases and a comparison of per-patient costs between specific therapeutic areas and the general average.
  • Average phase costs (source):
    • Phase 1: $4 million
    • Phase 2: $13 million
    • Phase 3: $20 million
  • Per-patient costs vary by therapeutic area:

Pragmatic Trials (RECOVERY & Broader Evidence)

Comparison of trial costs per patient between pragmatic and traditional methods, highlighting factors like infrastructure use and simplified monitoring that drive the 82-fold cost reduction in the RECOVERY trial.

Comparison of trial costs per patient between pragmatic and traditional methods, highlighting factors like infrastructure use and simplified monitoring that drive the 82-fold cost reduction in the RECOVERY trial.

Speed and Efficiency

RECOVERY Trial Metrics

An infographic illustrating the RECOVERY trial’s rapid timeline from concept to policy implementation alongside its massive scale across 200+ hospitals and 47,000+ participants.

An infographic illustrating the RECOVERY trial’s rapid timeline from concept to policy implementation alongside its massive scale across 200+ hospitals and 47,000+ participants.
  • 9 days: Concept to first patient enrollment138
  • 10 weeks: First life-saving treatment identified139
  • 3 hours: Results to policy implementation139
  • 47,000+ participants across 6 countries140
  • 200+ hospital sites140
  • 10 major results obtained140
  • 4 effective COVID-19 treatments identified140

Traditional Trial Metrics

Key pain points in traditional clinical trials, highlighting the 7.2-year average development timeline and the high rates of enrollment and site-level failure.

Key pain points in traditional clinical trials, highlighting the 7.2-year average development timeline and the high rates of enrollment and site-level failure.
  • Average time from phase 1 to approval: 7.2 years
  • 80% of trials fail to meet enrollment timelines141
  • Up to 50.0% of research sites enroll one or no patients141

Clinical Impact

RECOVERY Trial

A visual summary of the RECOVERY trial results for dexamethasone, illustrating the 35 percent mortality reduction for ventilated patients and the timeline from results to saving one million lives globally.

A visual summary of the RECOVERY trial results for dexamethasone, illustrating the 35 percent mortality reduction for ventilated patients and the timeline from results to saving one million lives globally.
  • Dexamethasone findings138:
    • 35% reduction in mortality for ventilated patients
    • Estimated 1 million lives saved globally140
  • Implementation within hours of results
  • Real-world effectiveness immediately apparent

Traditional Trials

Advantages of Pragmatic Trials

An infographic highlighting the four key pillars of pragmatic trial advantages: Generalizability, Resource Efficiency, Implementation Speed, and Statistical Power.

An infographic highlighting the four key pillars of pragmatic trial advantages: Generalizability, Resource Efficiency, Implementation Speed, and Statistical Power.
  1. Better Generalizability

    • Results apply to broader patient populations
    • Findings directly relevant to routine clinical practice
    • Higher external validity
  2. Resource Efficiency

    • Uses existing healthcare infrastructure
    • Lower per-patient costs
    • Faster recruitment and completion
  3. Implementation Speed

    • Rapid translation to clinical practice
    • Immediate real-world validation
    • Reduced lag between evidence and practice
  4. Statistical Power

    • Larger sample sizes possible
    • More diverse patient populations
    • Better representation of real-world outcomes