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Association Between Psoriasis and Dementia: A Population-Based Case–Control Study

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Abstract

Background

Dementia is a syndrome that involves the deterioration of several higher mental functions in advanced age, and psoriasis is an autoimmune disease characterized by skin plaque. Epidemiological studies have indicated an association between dementia and psoriasis; however, to date, no studies in Asia have reported this association.

Objective

This study used a population-based medical dataset to explore the association between previously diagnosed psoriasis and dementia in Taiwan.

Methods

Using the Taiwan Longitudinal Health Insurance Database 2000, we identified 7118 individuals with a diagnosis of dementia; a further 21,354 sex- and aged-matched individuals were randomly extracted as controls. Patients with bullous pemphigoid, which is characterized by inflammatory phenomena similar to that evident in psoriasis, were chosen as a control group. Conditional logistic regression was performed to evaluate the association between dementia and prior psoriasis or bullous pemphigoid among the sampled patients.

Results

Of the 28,472 individuals, 2.2, 3.0, and 1.5% of the total, case, and control groups, respectively, had been diagnosed with psoriasis. After adjustments were made for patients’ monthly income, region, urbanization level, diabetes, hyperlipidemia, hypertension, and coronary heart disease, the odds ratio (OR) of diagnosed psoriasis for the case group was 1.46 (95% confidence interval [CI] 1.23–1.73; p < 0.001) compared with the control group. The ORs of a previous psoriasis diagnosis with arthritis and without arthritis in the case group were, respectively, 1.95 and 1.44 times (95% CI 1.03–3.89 and 1.21–1.72, respectively) those of the control group after adjustments for socioeconomic variables, diabetes, hyperlipidemia, hypertension, and coronary heart disease. However, no significant differences in prior bullous pemphigoid were observed between the dementia and control groups (0.5% and 0.4%, respectively).

Conclusions

More patients with dementia had prior psoriasis than did patients in the control group. Additional research is required to confirm our results and clarify the relationship.

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Correspondence to Hung-Wen Chiu.

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Funding

No sources of funding were used to conduct this study or prepare this manuscript.

Conflict of Interest

Ching-Chun Lin, Herng-Ching Lin, and Hung-Wen Chiu have no conflicts of interest that are directly relevant to the content of this article.

Ethical approval

The datasets used in this study contain deidentified secondary data with anonymous numbers from the Taiwan National Health Research Institute. This study was exempt from full review and approved by the Institutional Review Board of Taipei Medical University.

Informed consent

This study used deidentified secondary data that have been released by the NHI research database to the public for research purposes. Personal data were encrypted and patient privacy was protected in this research; therefore, written informed consent from the participants was not necessary.

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Lin, CC., Lin, HC. & Chiu, HW. Association Between Psoriasis and Dementia: A Population-Based Case–Control Study. Am J Clin Dermatol 20, 457–463 (2019). https://doi.org/10.1007/s40257-018-00420-8

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  • DOI: https://doi.org/10.1007/s40257-018-00420-8

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