House of Lords written question – answered at on 7 February 2011.
The words were omitted for the sake of brevity. The inclusion of a definition of "level B" would have resulted in a longer reply. In its Systematic Review of Water Fluoridation, the University of York categorised level B research as providing evidence of moderate quality, moderate risk of bias, including studies that started within three years of the initiation or discontinuation of water fluoridation, with a prospective follow-up for outcomes, studies that measured and adjusted for less than three but at least one confounding factor and studies in which fluoridation status of participants was known to those assessing primary outcomes but other provisions were made to prevent measurement bias.
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