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Double blinding with a new placebo needle: a further validation study.
Nobuari Takakura1, Miho Takayama, Akiko Kawase
1Department of Acupuncture and Moxibustion, Faculty of Health Sciences, Tokyo Ariake University of Medical and Health Sciences, 2-9-1 Ariake, Koto-ku, Tokyo 135-0063, Japan. takakura@t-ariake.ac.jp
Summary
Acupuncture practitioners could not reliably distinguish between real and placebo needles, with a slight tendency to correctly identify penetrating needles. Most judgments were uncertain, posing minimal risk to double-blinding in clinical trials.
Area of Science:
- Acupuncture research
- Clinical trial methodology
- Blinding techniques
Background:
- Investigated the efficacy of a novel non-penetrating placebo acupuncture needle in maintaining double-blind conditions.
- Observed that practitioners could sometimes identify needles, potentially compromising blinding if they were confident.
Purpose of the Study:
- To identify the specific sensory clues that led acupuncture practitioners to correctly identify needle types.
- To assess the level of confidence practitioners had in their needle identification decisions.
Main Methods:
- Ten practitioners applied three needle types (skin-touch placebo, non-touch control, penetrating) blindly and randomly.
- Practitioners judged needle type, confidence, and sensory clues after application.
Main Results:
- Practitioners correctly identified an average of 10.4 out of 30 needles, with no significant difference in confidence between correct and incorrect judgments.
- Penetrating needles were correctly identified more often than chance (p < 0.01), while placebo needles were not.
- The 'feeling of needle insertion' was a common clue (53%), but often led to incorrect judgments (57%).
Conclusions:
- Practitioners showed a slight tendency to correctly identify penetrating acupuncture needles but lacked certainty in most judgments.
- The uncertainty in judgments poses a minimal risk to the integrity of double-blinding in acupuncture research.
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