The London-based Science Media Centre, which assists reporters when major science news breaks, posted an entire page of criticisms, most notably its poor design, the use of tumor prone rodents, the small sample size and the selective presentation of data.

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"The formula effect generally, and particularly in the case of clothing, is dependent not just on the choice of index but also on the characteristics of the price movements and levels being measured, sample design, choice of base period and price collection methods, " said its spokeswoman Jill Leyland.

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Based on any audio sample, the shape of the design represents the audio waveform.

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The sample design still does not permit comparisons of smaller subsets, such as districts or schools, although some districts have given the tests on their own in order to make such comparisons.

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