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The association between iron and neurocognition remains underexplored in adolescents, and the neurocognitive effects of low and high iron levels have yet to be established. The aim of this study was to investigate the relationships of low and high iron levels with neurocognitive domains in early adolescents.

The sample comprised 428 adolescents (12.0 ± 0.4 years) from Jintan, China. Serum iron concentrations were analyzed from venous blood samples and classified into low, normal, and high levels according to the clinical reference range 75–175 μg/dl. Neurocognition was measured by the Penn Computerized Neurocognitive Battery and Wechsler Intelligence Scale. Generalized linear regression was used to analyze relationships.

Prevalence rates of iron deficiency, normal iron, and high iron were 13.8%, 76.4%, and 9.8%, respectively. Compared with normal levels, iron deficiency …