A trial design that generates only ''positive'' results.

Area of Science:

• Pain Management
• Clinical Trial Methodology
• Acupuncture Research

Background:

• Randomized clinical trials (RCTs) are crucial for evaluating therapeutic interventions like acupuncture.
• Concerns exist regarding potential biases in specific RCT designs, particularly in pain research.
• The "A + B versus B" design is increasingly used but its validity is debated.

Purpose of the Study:

• To test the hypothesis that "A + B versus B" RCTs for acupuncture in pain management are prone to false positive findings.
• To identify design features that may influence the likelihood of false positive results in acupuncture trials.
• To critically evaluate the methodological rigor of acupuncture studies with specific comparative designs.

Main Methods:

• Systematic electronic search of six databases for relevant acupuncture RCTs.
• Inclusion criteria focused on studies comparing "A + B" (acupuncture plus other treatments) versus "B" (other treatments alone) for pain.
• Analysis of the reported outcomes and statistical significance of included studies.

Main Results:

• Thirteen studies met the inclusion criteria.
• All studies suggested acupuncture was effective for pain relief.
• Twelve studies reported statistically significant positive results; one showed a positive trend.

Conclusions:

• The "A + B versus B" design in acupuncture RCTs for pain is associated with a high likelihood of false positive results.
• Specific methodological features within this design may exacerbate or mitigate bias.
• Further research is needed to refine trial designs and ensure the reliable evaluation of acupuncture's efficacy.