• Shirley Braga Lima Gamonal, Aloisio Carlos Couri Gamonal, Nathália Couri Vieira Marques, Marcos Antônio Fernandes Brandão, and Nádia Rezende Barbosa Raposo.
• MD, MSc, PhD. Researcher, Physician and Professor, Núcleo de Pesquisa em Dermatologia (NUPEDE), Faculty of Medicine, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora (MG), Brazil; and Researcher, Núcleo de Pesquisa e Inovação em Ciências da Saúde (NUPICS), Faculty of Pharmacy, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora (MG), Brazil.
• Sao Paulo Med J. 2022 Jan 1; 141 (2): 131137131-137.

BackgroundHypovitaminosis D is a public health problem associated with several chronic inflammatory and immunological diseases, including psoriasis.ObjectivesThis study aimed to determine the prevalence of hypovitaminosis D in patients with plaque psoriasis. A comparison was made between vitamin D levels in patients with psoriasis and those with other non-inflammatory dermatoses without photosensitivity. In addition, it evaluated the effects of the patients' Fitzpatrick skin phototype and the season of the year on the serum levels of vitamin D.Design And SettingsA retrospective cross-sectional study was conducted at an outpatient clinic in a university center in Juiz de Fora (MG), Brazil.MethodsA review of dermatology patients' demographic data, including skin phototype and serum levels of 25-hydroxyvitamin D [25(OH)D], over 12 months in 2016.ResultsThis study included 554 patients: 300 patients allocated to the plaque psoriasis group and 254 control patients with other dermatological diseases. Regarding the season of the year, 229, 132, 62, and 131 participants were evaluated in summer, autumn, winter, and spring, respectively. As for the skin phototype, 397, 139, and 18 patients had phototypes III, IV, and V, respectively. The serum levels of 25(OH)D were significantly lower in the psoriasis group (24.91 ± 7.16 ng/mL) than in the control group (30.37 ± 8.14 ng/mL).ConclusionsHypovitaminosis D (< 30 ng/mL) was present in 76.66% of patients with psoriasis versus 53.94% of control patients. Vitamin D deficiency (< 20 ng/mL) was observed in 25% of the patients with psoriasis versus 8.66% in the control group (P < 0.001). The season and patient's skin phototype were independent predictors of serum vitamin D levels.

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