Risks of developing psychiatric disorders in pediatric patients with psoriasis.

BACKGROUND Symptoms of psoriasis can be embarrassing and distressing, and may increase risk of developing psychiatric disorders in young people. OBJECTIVE We sought to compare incidences of psychiatric disorders between pediatric patients with psoriasis and psoriasis-free control subjects. METHODS Patients (<18 years) with continuous health plan enrollment 6 months before and after first psoriasis diagnosis (index date) were selected (Thomson Reuters MarketScan database, 2000-2006 [Thomson Reuters, New York, NY]). Patients with psoriasis (N = 7404) were matched 1:5 on age and sex to psoriasis-free control subjects (N = 37,020). Patients were followed from index date to first diagnosis of a psychiatric disorder (ie, alcohol/drug abuse, depression, anxiety disorder, bipolar disorder, suicidal ideation, eating disorder), end of data availability, or disenrollment. Patients with psychiatric diagnoses or psychotropic medication use before the index date were excluded. Cox proportional hazard models controlling for age, sex, and comorbidities were used to estimate the effect of psoriasis on risks of developing psychiatric disorders. RESULTS Patients with psoriasis were significantly more at risk of developing psychiatric disorders versus control subjects (5.13% vs 4.07%; P = .0001; hazard ratio = 1.25; P = .0001), especially depression (3.01% vs 2.42%; P = .0036; hazard ratio = 1.25; P = .0053) and anxiety (1.81% vs 1.35%; P = .0048; hazard ratio = 1.32; P = .0045). LIMITATIONS Retrospective, observational studies of medical claims data are typically limited by overall quality and completeness of data and accuracy of coding for diagnoses and procedures. CONCLUSIONS Pediatric patients with psoriasis had an increased risk of developing psychiatric disorders, including depression and anxiety, compared with psoriasis-free control subjects.