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Psychol Med. 2019 Jul 22:1-7. doi: 10.1017/S0033291719001739. [Epub ahead of print]

Vitamin D concentration and psychotic disorder: associations with disease status, clinical variables and urbanicity.

Author information

1
Department of Psychiatry & Neuropsychology,School for Mental Health and Neuroscience, Maastricht University Medical Center,Maastricht,the Netherlands.
2
Department of Psychiatry,Icahn School of Medicine,Mount Sinai, NY,USA.
3
Department of Child and Adolescent Psychiatry,University of Groningen, University Medical Center Groningen,Groningen,the Netherlands.
4
Department of Laboratory Medicine,University of Groningen, University Medical Center Groningen,Groningen,the Netherlands.
5
University Center for Psychiatry, Rob Giel Research Center, University of Groningen, University Medical Center Groningen,Groningen,the Netherlands.

Abstract

BACKGROUND:

The association between schizophrenia and decreased vitamin D levels is well documented. Low maternal and postnatal vitamin D levels suggest a possible etiological mechanism. Alternatively, vitamin D deficiency in patients with schizophrenia is presumably (also) the result of disease-related factors or demographic risk factors such as urbanicity.

METHODS:

In a study population of 347 patients with psychotic disorder and 282 controls, group differences in vitamin D concentration were examined. Within the patient group, associations between vitamin D, symptom levels and clinical variables were analyzed. Group × urbanicity interactions in the model of vitamin D concentration were examined. Both current urbanicity and urbanicity at birth were assessed.

RESULTS:

Vitamin D concentrations were significantly lower in patients (B = -8.05; 95% confidence interval (CI) -13.68 to -2.42; p = 0.005). In patients, higher vitamin D concentration was associated with lower positive (B = -0.02; 95% CI -0.04 to 0.00; p = 0.049) and negative symptom levels (B = -0.03; 95% CI -0.05 to -0.01; p = 0.008). Group differences were moderated by urbanicity at birth (χ2 = 6.76 and p = 0.001), but not by current urbanicity (χ2 = 1.50 and p = 0.224). Urbanicity at birth was negatively associated with vitamin D concentration in patients (B = -5.11; 95% CI -9.41 to -0.81; p = 0.020), but not in controls (B = 0.72; 95% CI -4.02 to 5.46; p = 0.765).

CONCLUSIONS:

Lower vitamin D levels in patients with psychotic disorder may in part reflect the effect of psychosis risk mediated by early environmental adversity. The data also suggest that lower vitamin D and psychopathology may be related through direct or indirect mechanisms.

KEYWORDS:

Psychotic disorder; schizophrenia; urbanicity; vitamin D

PMID:
31327333
DOI:
10.1017/S0033291719001739

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