ABSTRACT
Vitamin D deficiency is a public health concern even in sunny areas, so we decided to assess the prevalence of vitamin D deficiency and its related factors among university students in Shiraz. This cross-sectional study was carried out on 254 [128 male and 126 female] university students. Demographic questionnaires and a questionnaire on exposure to sun light and sun protection were completed by the participants. Serum 25OH-vitamin D was measured using a radioimmunoassay kit. Data analysis was done using Statistical Package for Social Sciences [SPSS] software # 16. A P value less than 0.05 was considered as significant. Mean +/- standard deviation [SD] of serum 25OH-vitamin D was 49.29 +/- 12.87 [nmol/l] and 27.46 +/- 10.37 [nmol/l] among male and female students, respectively. 51.2% of female students were vitamin D insufficient and 44% of them had vitamin D deficiency. Prevalence of vitamin D insufficiency and marginal status among male students were 49.5 and 48%, respectively. Serum vitamin D of female students was significantly less than the males [P < 0.001]. Serum vitamin D was negatively correlated to sun protection score [P < 0.001, r = 0.50], but there was no correlation between serum vitamin D and sun exposure. Vitamin D deficiency especially among female students is alarmingly prevalent. Increasing use of sunscreen lotion and clothing style could be the main factors inhibiting endogenous vitamin D synthesis which results in its deficiency