Hair element content in learning disabled children

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Science  14 Oct 1977:
Vol. 198, Issue 4313, pp. 204-206
DOI: 10.1126/science.905825


Hair samples from 31 learning disabled and 22 normal children were analyzed for content of 14 elements. Significant group differences were determined and a discriminant function was completed which separated the groups with 98 per cent accuracy. Elevated lead and cadmium content in the learning disabled group is viewed as being of particular importance.