• 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.
• Sao Paulo Med J. 2022 Jan 1; 141 (3): e2022216e2022216.

BackgroundPsoriasis is a systemic, immune-mediated disease characterized by inflammatory manifestations in the skin and joints. Vitamin D deficiency is currently considered a pandemic and is associated with comorbidities including psoriasis and psoriatic arthritis (PsA).ObjectivesTo determine the prevalence of hypovitaminosis D [25(OH)D] in patients with plaque psoriasis, with and without PsA, and of independent predictors of serum 25(OH)D levels.Design And SettingRetrospective cross-sectional study conducted among 300 patients at an outpatient clinic in a university center in Juiz de Fora, Minas Gerais, Brazil.MethodsDemographic and clinical data (psoriasis area and severity index [PASI], family history, age at onset, disease duration, and the presence of PsA according to Classification Criteria for Psoriatic Arthritis), skin phototype, and season of the year were reviewed.ResultsHypovitaminosis D (< 30 ng/mL) was highly prevalent in patients with psoriasis with and without PsA (82.2% and 74.9%, respectively). An inverse correlation between PASI and vitamin D was found (without PsA r = -0.59 and, PsA r = -0.52, P < 0.001), and multivariate regression revealed that hypovitaminosis D was associated with disease severity, season, and phototype. It was confirmed by binary logistic regression between PASI and vitamin D deficiency (< 30 ng/mL), (odds ratio, OR 1.78 CI: -0.20-0.53, P < 0.001).ConclusionHypovitaminosis D (< 30 ng/mL) was highly prevalent in psoriatic patients with and without PsA. Season and skin phototype were associated with 25(OH)D levels. An inverse association between PASI and serum 25(OH)D levels was established.

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