This study aims to calculate current and accurate prevalence and incidence estimates for atopic dermatitis (AD) by age group and sociodemographic factors. It also aims to describe the burden of comorbidity in AD with a focus on atopic and mental health conditions. The study also aims to describe the health care resource utilisation of this cohort in terms of prescription use, primary care appointments, and specialist referrals.
Method This study will define AD cases using a previously validated algorithm for case identification use clinical codes form primary care in the UK (Read codes). The study will analyse the population prevalence and incidence of AD using this definition over a 10-year period (2008-2018). Within this population the prevalence of autoimmune conditions (rheumatoid arthritis, inflammatory bowel disease, coeliac disease, type 1 diabetes, and multiple sclerosis) will be reported and compared with a cohort of individuals without a diagnosis of AD, matched by age and sex at GP practice level. In the same cohort, the annual use of topical and oral medications used for the treatment of AD, primary care appointments, and specialist referrals, overall and stratified by sociodemographic factors will also be reported.