This study series consists of four related studies and aims to explore and describe many important elements of alopecia areata over three key areas: (1) the current epidemiology of alopecia areata, (2) the prevalence and incidence of psychiatric co-morbidities in people with alopecia areata, (3) the prevalence and incidence of autoimmune and atopic conditions in people with alopecia areata, and (4) the incidence of common infections in people with alopecia areata.
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Study 1: The incidence of Alopecia Areata
Timeframe: Overall during 2009-2018 inclusive
Study 1: The incidence of Alopecia Areata stratified by sociodemographic factors
Timeframe: Overall during 2009-2018 inclusive
Study 1:The annual rate of primary care visits for people with Alopecia Areata.
Timeframe: Within one year of diagnosis of Alopecia Areata
Study 1: Secondary care dermatology service utilisation
Timeframe: Within one year of diagnosis of Alopecia Areata
Study 2: The prevalence of common mental health conditions in adult patients diagnosed with Alopecia Areata at the time of diagnosis
Timeframe: At the time of diagnosis in all patients diagnosed with Alopecia Areata 2009-2018 inclusive
Study 2: Describe the incidence of common mental health conditions in adult patients with Alopecia Areata
Timeframe: Within two years of diagnosis of Alopecia Areata
Study 2: Describe the mental health medication treatment burden of adult patients diagnosed with Alopecia Areata.
Timeframe: Within two years of diagnosis of Alopecia Areata
Study 2: Number of patients diagnosed with Alopecia Areata receiving mental health psychological intervention.
Timeframe: Within two years of diagnosis of Alopecia Areata
Study 3: Describe the prevalence of atopic and autoimmune conditions in adult patients diagnosed with Alopecia Areata at the time of diagnosis
Timeframe: At the time of diagnosis in all patients diagnosed with Alopecia Areata 2009-2018 inclusive
Study 3: Describe the incidence of atopic and autoimmune conditions in adult patients with Alopecia Areata.
Timeframe: Within five years of Alopecia Areata diagnosis
Study 4: The incidence of a composite of common infections in adult patients with Alopecia Areata
Timeframe: Within five years of Alopecia Areata diagnosis
Study 4: The incidence of a composite of viral infections in adult patients with Alopecia Areata
Timeframe: Within five years of Alopecia Areata diagnosis