Vitamin D Supplementation in Chronic Schizophrenia Patients Treated with Clozapine: A Randomized, Double-Blind, Placebo-controlled Clinical Trial.

Participants on vitamin D increased significantly mean attention score from 4.17 at baseline to 4.58 at endpoint (z = − 2.23, p = 0.026), while the increase in mean attention score in the participants on placebo (from 3.95 at baseline to 4.04 at endpoint) did not reach statistical significance (z = − 0.35, p = 0.725). 3.3 Metabolic Measures There was no difference between the vitamin D and placebo groups with regard to change in metabolic parameters over time (see Table 2 ).

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