Age, Gender and Season Are Good Predictors of Vitamin D Status Independent of Body Mass Index in Office Workers in a Subtropical Region

This study aimed at determining the prevalence and predictors of hypovitaminosis D (serum 25-hydroxyvitamin D &lt
30 ng/mL) among office workers in a subtropical region from an electronic hospital database. Totally, 2880 office workers aged 26&ndash
65 years who received health examinations with vitamin D status and total calcium concentrations at a tertiary referral center were retrospectively reviewed. Subjects were divided into groups according to genders, age (i.e., 26&ndash
35, 36&ndash
45, 46&ndash
55, 56&ndash
65), body-mass index (BMI) (i.e., obese BMI &ge
30, overweight 25 &le
BMI &lt
30, normal 20 &le
25, and underweight BMI &lt
20) and seasons (spring/winter vs. summer/autumn) for identifying the predictors of hypovitaminosis D. Corrected total calcium level &lt
8.4 mg/dL is considered as hypocalcemia. Multivariate logistic regression demonstrated that females (AOR 2.33, (95% CI: 1.75, 3.09)), younger age (4.32 (2.98, 6.24), 2.82 (1.93, 4.12), 1.50 (1.03, 2.17)), and season (winter/spring) (1.55 (1.08, 2.22)) were predictors of hypovitaminosis D, whereas BMI was not in this study. Despite higher incidence of hypocalcemia in office workers with hypovitaminosis D (p &lt
0.001), there was no association between vitamin D status and corrected total calcium levels. A high prevalence (61.9%) of hypovitaminosis D among office workers in a subtropical region was found, highlighting the importance of this occupational health issue.