Box plots of the comparison of 25-hydroxyvitamin D values of inmates stratified by race.

<p>This figure shows that black inmates have a significantly lower 25(OH)D level compared to the white inmates (p<0.001), but similar levels to inmates categorized as Others (p = 0.54). There was inadequate power to detect a difference between black (n = 107) and Asian (n = 7) inmates (p = 0.1). Note: 50 nmol/L = 20 ng/mL.</p

The relationship between serum concentrations of 25-hydroxyvitamin D [25(OH)D] and years of incarceration.

<p>This figure shows a weakly significant relationship between the years of incarceration and serum concentration of 25(OH)D in all inmates after adjusting for age, race, season, and BMI (β = 0.09, r² = 0.07, p = 0.042). A similar investigation in inmates in the maximum security level showed no significant relationship between 25(OH)D and the duration of incarceration (β = 0.09, r² = 0.09, p = 0.49).</p

Characteristics of Prison Inmates Stratified by Gender.

<p>Characteristics of Prison Inmates Stratified by Gender.</p

Graph of the relationship between 25(OH)D and the seasons in black and white prisoners.

<p>Black inmates had significantly lower 25(OH)D levels in all of the seasons except for Fall.</p

Complex box plots of the comparison of 25-hydroxyvitamin D values of inmates stratified by both race and the security level of incarceration.

<p>This figure shows a significant difference in 25(OH)D level between the black and white inmates at both the maximum security level (p = 0.015), and the medium security level (p = 0.001), but not at the minimum security level (p = 0.40). Note: 50 nmol/L = 20 ng/mL.</p

Proportion of Inmates with Vitamin D Deficiency, Insufficiency, and Sufficiency within each Racial Category.

<p>Proportion of Inmates with Vitamin D Deficiency, Insufficiency, and Sufficiency within each Racial Category.</p

Study Flow Diagram.

<p>Study Flow Diagram.</p