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UK Against Fluoridation

Saturday, October 14, 2017

Are fluoride levels in drinking water associated with hypothyroidism prevalence in England?

Are fluoride levels in drinking water associated with hypothyroidism prevalence in England? A large observational study of GP practice data and fluoride levels in drinking water.

While previous research has suggested that there is an association between fluoride ingestion and the incidence of hypothyroidism few population level studies have been undertaken. In England approximately 10% of the population lives in areas with community fluoridation schemes and hypothyroidism prevalence can be assessed from general practice data.

This observational study examines the association between levels of fluoride in water supplies with practice level hypothyroidism prevalence. Methods: We used a cross-sectional study design using secondary data to develop binary logistic regression models of predictive factors for hypothyroidism prevalence at practice level using 2012 data on fluoride levels in drinking water, 2012/13

Quality Outcomes Framework (QOF) diagnosed hypothyroidism prevalence data, 2013 General Practitioner (GP) registered patient numbers, and 2012 practice level Index of Multiple Deprivation scores 2 Findings: We found that higher levels of fluoride in drinking water provide a useful contribution for predicting prevalence of hypothyroidism. We found that practices located in the West Midlands (a wholly fluoridated area) are nearly twice as likely to report high hypothyroidism prevalence in comparison to Greater Manchester (non-fluoridated area).........................

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