It has been observed that a single arm study is designed to validate a pharmacopoeial formulation for its effectiveness. As such there is no guideline available in India for acceptance of the level of evidence required to support validation of a traditional medicinal product.
Anubha Chandla
No !
But single arm trials do provide the preliminary data on the efficacy of a formulation
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3059315/#__ffn_sectitle
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Mohammad al-Attar
science philosophy question.
in short answer: it depends on the result of the single-arm study or before-after study, actually on effect size.
for example: if some intervention killed (=effect size) all (=sample size) victims, it will be toxin; RCTs are kind of Scientific ignorance.
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