Increased risks of psychiatric disorders in patients with primary Sjogren's syndrome-a secondary cohort analysis of nationwide, population-based health claim data

Introduction/objectives Primary Sjogren's syndrome (pSS) is a chronic systemic autoimmune disease. The aim of this study was to investigate the risk of five common psychiatrist-diagnosed disorders in patients with pSS. Method Using Taiwan's National Health Insurance Research Database, 688 patients with newly diagnosed pSS between 2000 and 2012 were identified. Two comparison cohorts were assembled, namely, 3440 patients without pSS and 1302 newly diagnosed patients with rheumatoid arthritis. The incidences of depressive disorder, anxiety disorder, bipolar disorder, sleep disorder, and schizophrenia between the pSS cohort and the comparison cohorts were compared using Poisson regression models. Results Patients with pSS exhibited a significantly higher risk of developing depressive disorder (adjusted incidence rate ratio [aIRR] = 2.11, p < 0.001), anxiety disorder (aIRR = 2.20, p < 0.001), and sleep disorder (aIRR = 1.76, p = 0.012) when compared with the non-pSS cohort. The risks of developing depressive, anxiety, and sleep disorders were also significantly increased when compared to the rheumatoid arthritis comparison cohort. When the analyses were stratified by sex, depressive disorder (aIRR = 2.10, p < 0.001), anxiety disorder (aIRR = 2.02, p = 0.001), and sleep disorder (aIRR = 1.74, p = 0.022) were found to be significantly increased in female patients with pSS. However, only anxiety disorder (aIRR = 4.88, p = 0.044) was also significantly increased in male patients with pSS. The peak age group of developing depressive disorder was 65-80 years old (aIRR = 3.46, p < 0.001). Conclusions In this retrospective cohort study based on population-based claim data, significantly increased incidences of depressive disorder, anxiety disorder, and sleep disorder were observed in patients with pSS.