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. 2008 Oct;65(10):1136-44.
doi: 10.1001/archpsyc.65.10.1136.

Maternal iron deficiency and the risk of schizophrenia in offspring

Beverly J Insel  1 , Catherine A Schaefer, Ian W McKeague, Ezra S Susser, Alan S Brown
Affiliations

Maternal iron deficiency and the risk of schizophrenia in offspring

Beverly J Insel et al. Arch Gen Psychiatry. 2008 Oct.

Abstract

Context: Iron is essential for brain development and functioning. Emerging evidence suggests that iron deficiency in early life leads to long-lasting neural and behavioral deficits in infants and children. Adopting a life course perspective, we examined the effects of early iron deficiency on the risk of schizophrenia in adulthood.

Objective: To determine whether maternal iron deficiency, assessed by maternal hemoglobin concentration during pregnancy, increases the susceptibility to schizophrenia spectrum disorders (SSDs) among offspring.

Design: Data were drawn from a population-based cohort born from 1959 through 1967 and followed up for development of SSD from 1981 through 1997.

Participants: Of 6872 offspring for whom maternal hemoglobin concentration was available, 57 had SSDs (0.8%) and 6815 did not (99.2%).

Main outcome measure: Prospectively assayed, the mean value of maternal hemoglobin concentration was the primary exposure. Hemoglobin concentration was analyzed as a continuous and a categorical variable.

Results: A mean maternal hemoglobin concentration of 10.0 g/dL or less was associated with a nearly 4-fold statistically significant increased rate of SSDs (adjusted rate ratio, 3.73; 95% confidence interval, 1.41-9.81; P = .008) compared with a mean maternal hemoglobin concentration of 12.0 g/dL or higher, adjusting for maternal education and ethnicity. For every 1-g/dL increase in mean maternal hemoglobin concentration, a 27% decrease in the rate of SSDs was observed (95% confidence interval, 0.55-0.96; P = .02).

Conclusions: The findings suggest that maternal iron deficiency may be a risk factor for SSDs among offspring. Given that this hypothesis offers the potential for reducing the risk for SSDs, further investigation in independent samples is warranted.

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Figures

Figure 1
Figure 1
Case ascertainment in the Prenatal Determinants of Schizophrenia (PDS) study cohort. DIGS indicates Diagnostic Interview for Genetic Studies; SSDs, schizophrenia spectrum disorders.
See this image and copyright information in PMC

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