Acupuncture Trials From China and Elsewhere: Reporting and Reliability Questions
What meta-research found about acupuncture trials published in China and in other countries: high rates of positive results, blinding gaps, and why population differences may matter too.
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A recent look inside Cochrane reviews
A 2023 study, by authors based mostly in China with international co-authors, examined 84 Cochrane reviews that included acupuncture. [2] Only 31 of these reviews (37%) searched Chinese databases. [2] Key findings:| Question | What the study found |
|---|---|
| Effect size | Chinese-language trials were associated with a larger effect (pooled ratio of odds ratios 0.51) [2] |
| Blinding | Higher risk of bias in blinding of participants and personnel: 97% in Chinese-language trials vs 51% in others [2] |
| Is bias the explanation? | No evidence that higher bias inflated effects more often in Chinese-language studies than in other studies [2] |
| Patients | Acupuncture appeared more effective in Chinese than in non-Chinese populations [2] |
The authors concluded that higher risk of bias may lead to overestimating acupuncture's effects in general, but that the gap between Chinese-language and other studies was probably associated with differences in population characteristics. [2] This is the authors' interpretation of an observational comparison. It does not prove that patients in China respond differently, and it does not rule out other causes.
Reporting standards were built internationally
The revised STRICTA reporting checklist for acupuncture trials came from a collaboration that included the Chinese Cochrane Centre. [3] It aims to make interventions and comparisons clear so any reader can judge them. [3]Practical questions
- Was the trial registered before it started, and does the paper report the registered primary outcome? A study of 88 acupuncture trials found only 19.3% were registered in advance. [4]
- Was a sham used, and could participants and assessors be blinded?
- Do the results hold in other populations?
- Does the review include Chinese-language studies, and did it check their risk of bias separately?
Blanket statements like "all Chinese trials are unreliable" are not supported by the sources we read. Equally, a claim that "thousands of trials prove it" deserves the same scrutiny. For the bigger picture, see quality and bias in acupuncture trials and what acupuncture is.
Frequently asked questions
Are Chinese acupuncture trials less reliable?
Chinese-language trials in Cochrane reviews were associated with larger effects and more often lacked blinding, [2] but the same study found no evidence that bias inflated their effects more than it did in other studies. [2]
Why do some countries report mostly positive results?
A 1998 review found all acupuncture trials from China, Japan, Hong Kong and Taiwan were positive and named publication bias as a possible explanation. [1]
Does acupuncture work differently in Chinese patients?
One study found it appeared more effective in Chinese than non-Chinese populations and linked the gap to population characteristics, [2] but this is observational and not proven.
Should I ignore studies from China?
No source we read recommends that. Judge each study by the same questions: blinding, comparison, registration, size. [4]
Do international standards for acupuncture trials exist?
Yes. STRICTA is an official extension of the CONSORT reporting statement, developed with the Chinese Cochrane Centre among others. [3]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
An early warning: very high rates of positive results
Two limits: the study covered abstracts up to June 1995, and it cannot tell you whether more recent Chinese trials are different. Proper evidence not found in what we read for a modern repeat of this exact comparison.
References
- Vickers A et al. Do certain countries produce only positive results? A systematic review of controlled trials. Control Clin Trials 1998. Read 2026-10-22.
- Li J et al. The relationship of publication language, study population, risk of bias, and treatment effects in acupuncture related systematic reviews: a meta-epidemiologic study. BMC Med Res Methodol 2023. Read 2026-10-22.
- MacPherson H et al. Revised STandards for Reporting Interventions in Clinical Trials of Acupuncture (STRICTA): extending the CONSORT statement. J Altern Complement Med 2010. Read 2026-10-22.
- Empirical evidence for outcome reporting bias in randomized clinical trials of acupuncture: comparison of registered records and subsequent publications. Trials 2015. Read 2026-10-22.