Alteration of Vitamin D levels according to age, gender and months in Ordu

This study aimed to evaluate the levels of vitamin D among children and adults in Ordu, Türkiye, and to analyze variations based on age, gender, and seasonal effects. A total of 29,556 patients (7.620 children and 21.936 adults) were included in this retrospective study, with data collected from the automation system of Ordu Training and Research Hospital between April 1, 2021, and December 31, 2022. Statistical analysis was performed using Microsoft Excel and MedCalc software, employing methods such as descriptive statistics, the Mann-Whitney U test for group comparisons, and the Chi-square test for categorical data. Results indicated that vitamin D levels varied significantly based on age and gender, with 79.1% of male and 86% of female children exhibiting vitamin D deficiency (<30 ng/mL). Among adults, 89.6% of male and 92% of female patients were found to be deficient. Seasonal variations further revealed that children had higher vitamin D levels in summer compared to winter (26.3 ng/mL vs. 17.6 ng/mL). Similarly, adults showed a seasonal trend, with summer average levels being higher than winter. The findings confirm a high prevalence of vitamin D deficiency in both children and adults in Ordu. The study underscores the importance of monitoring vitamin D levels across different demographics and emphasizes the need for public health interventions, including awareness campaigns and supplementation strategies, to combat vitamin D deficiency in the region.