Vitamin D status in 187,728 women in a tertiary hospital: effects of age and season

Aim: The aim of our study was to determine whether women admitted to our hospital for any reason have 25-hydroxyvitamin D (25(OH)D) deficiency and to determine whether there is a difference between serum 25(OH)D levels according to age and seasons. Materials and Methods: 187,728 female patients admitted to our hospital in winter and summer between 2020 and 2024 were included in the study. Ages, serum 25(OH)D levels, month and season of the examinations were recorded. Serum 25(OH)D levels: >30 ng/ml was considered adequate, 20-30 ng/ml vitamin D deficiency,