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Table 1 Clinical/demographic characteristics and differences in mean vitamin D by season of sampling, age categories, ethnicity & diagnoses

From: Clinical correlates of vitamin D deficiency in established psychosis

  Total (n = 324) Male (n = 193) Female (n = 131)
Mean age (SD) 43.8 (10.1) 43.2 (10.1) 44.7 (10.2)
Mean Duration of illness (SD) 16.5 (10.4) 17.1 (10.5) 15.6 (10.4)
Mean Vitamin D levels 12.4 (7.3) 12.2 (7.0) 12.6 (7.8)
  Mean 25-OHD levels (ng/ml) ± SD T df P Value
Age categories Age ≤ 44 (n = 172) Age > 44 (n = 152)    
12.1 ± 7.1 12.7 ± 7.5 −0.724 322 0.663
Diagnosis Non affective psychosis (i.e. Schizophrenia) (n = 218) Affective psychosis (Schizoaffective disorder, BPAD, psychotic depression) (n = 96)    
11.5 ± 6.7 14.3 ± 8.1 3.099 312 0.061
Mean 25-OHD levels (ng/ml) ± SD/Vitamin D deficiency % F df p Value
Season of sampling Autumn (n = 96)/38 % Winter (n = 70)/69 % Spring (n = 70)/60 % Summer (n = 88)/36 % 12.977 3 <0.001*
14.3 ± 7.31,2 9.4 ± 5.9 9.8 ± 4.82 14.7 ± 8.51,2
Ethnicity Black (n = 104) White (n = 183) Asian (n = 12) Mixed/Others (n = 24) 2.707 3 0.008*
  10.6 ± 5.93 13.5 ± 8.13 10.7 ± 8.4 12.4 ± 4.9
  1. Student-t tests and analysis of variance (ANOVA) were conducted to assess for differences in serum 25-OHD between groups. The *values represent the significant difference with p <0.05
  2. 1,2Mean serum 25-hydroxyvitamin D (25-OHD) levels were significantly decreased in those who had blood sampling in Winter compared to Summer or Autumn (p < 0.001) and were significantly decreased in Spring compared to Summer or Autumn (p < 0.001)
  3. 3Mean 25-OHD levels were significantly decreased in those of black ethnicity compared to those of white ethnicity (p = 0.002)