Background: Registry-based data are increasingly used in dermatological research. A recent epidemiological study has shown that the use of non-specific diagnostic codes is common among dermatologists.
Objectives: To study closely the use of the diagnostic codes L23.
Data on the severity of childhood-onset atopic dermatitis (AD) in relation to psychiatric comorbidities is scarce, even though AD predisposes to psychiatric comorbidities and the commonness of childhood-onset AD and its significance in disease progression are recognized. The purpose of this nationwide, register-based study of child patients diagnosed with AD in Finland between 1987 and 2017 was to determine how psychiatric comorbidities of AD patients differ depending on the disease severity of childhood-onset AD. AD severity was assessed by purchased AD treatment and risk of comorbidities was analyzed by the age of 18 and 30 years.
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