OBJECTIVE: This study aimed to investigate the effects of drinking water with high concentrations of iodine on the intelligence of children in Tianjin, China. METHODS: It was a population-based health survey utilizing a random cluster sampling design conducted in June 2005. Participants were recruited from the total population of primary school children attending years 1-4 with ages ranging from 8 to 10 years. Intelligence quotient (IQ) was assessed using the combined Raven's test, second edition. Linear regression analyses were applied to test for any association between water iodine concentration and IQ. RESULTS: A total of 1229 students were recruited with a mean IQ of 105.8 (95% CI: 104.2-107.3). Water analyses indicated iodine concentrations were high in one rural region and exceedingly high in another with median values of 137.5 and 234.7 microg/l, respectively. There was a significant association between residing in the very high water iodine region and a reduction of IQ by an average of about nine points (P = 0.022), after adjusting for the potential confounding factors. CONCLUSION: Exposure to high iodine concentrations in drinking water has detrimental effects on the intelligence of children.
OBJECTIVE: This study aimed to investigate the effects of drinking water with high concentrations of iodine on the intelligence of children in Tianjin, China. METHODS: It was a population-based health survey utilizing a random cluster sampling design conducted in June 2005. Participants were recruited from the total population of primary school children attending years 1-4 with ages ranging from 8 to 10 years. Intelligence quotient (IQ) was assessed using the combined Raven's test, second edition. Linear regression analyses were applied to test for any association between wateriodine concentration and IQ. RESULTS: A total of 1229 students were recruited with a mean IQ of 105.8 (95% CI: 104.2-107.3). Water analyses indicated iodine concentrations were high in one rural region and exceedingly high in another with median values of 137.5 and 234.7 microg/l, respectively. There was a significant association between residing in the very high wateriodine region and a reduction of IQ by an average of about nine points (P = 0.022), after adjusting for the potential confounding factors. CONCLUSION: Exposure to high iodine concentrations in drinking water has detrimental effects on the intelligence of children.
Authors: Stellena Mathiaparanam; Adriana Nori de Macedo; Andrew Mente; Paul Poirier; Scott A Lear; Andreas Wielgosz; Koon K Teo; Salim Yusuf; Philip Britz-Mckibbin Journal: Nutrients Date: 2022-06-21 Impact factor: 6.706
Authors: Ismail A R Kassim; Grainne Moloney; Ahono Busili; Abukar Yusuf Nur; Paolo Paron; Pieter Jooste; Hussein Gadain; Andrew J Seal Journal: J Nutr Date: 2014-02-05 Impact factor: 4.798