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  • Title: Iron deficiency and educational achievement in Thailand.
    Author: Pollitt E, Hathirat P, Kotchabhakdi NJ, Missell L, Valyasevi A.
    Journal: Am J Clin Nutr; 1989 Sep; 50(3 Suppl):687-96; discussion 696-7. PubMed ID: 2773846.
    Abstract:
    This double-blind clinical trial was conducted in Thailand to assess the impact of iron treatment on the IQ and educational attainment of 1358 9-11-y-old children. The children were classified into one of three groups: iron replete, iron depleted, and iron-deficient anemic. The Raven Progressive Matrices was used to measure IQ. A Thai language and a math test were administered to assess school attainment. A 50-mg/d tablet of ferrous sulphate was given for 2 wk and a 100 mg/d tablet, for 14 wk. An anthelminthic drug was given on the day of the blood test before treatment and 3 mo after the intervention started. There is evidence of a positive association between iron status and IQ and a language school achievement test but there is no support for the internal validity of the hypothesis that this association is causal.
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