Serum concentrations of 25-hydroxyvitamin D and depression in a general middle-aged to elderly population in Finland

Objectives Low concentrations of serum 25-hydroxyvitamin D [25(OH)D] have been postulated to associate with an increased prevalence of depression. As there are a limited number of publications on this issue, we examined the association between serum 25(OH)D and depression in a general middle-aged or older population.