Age at migration has a moderate, but statistically significant effect on DUP. The findings indicate migrating after school start is associated with a longer DUP in immigrant populations.
There is a strong association between low S-25(OH)D and higher negative and depressive symptoms in psychotic disorders. Randomized controlled trials should be performed to investigate the effect of vitamin D supplementation as adjuvant treatment strategy in patients with prominent negative or depressive symptoms.
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