The validity of register data to identify children with atopic dermatitis, asthma or allergic rhinoconjunctivitis
As medicine increases its need to manage populations of individuals with specific diseases to improve care and prevention at the lowest cost, large‐scale epidemiological studies using register‐based identification of subpopulations become increasingly valuable. Such studies can identify risk factors, and follow‐up on disease rates and interventions.
In a recent study, we developed methods, that is algorithms to identify children at a population level with atopic dermatitis, asthma or allergic rhinoconjunctivitis using data from public national health registers in Denmark and Sweden.2 These algorithms used information on disease‐specific dispensed prescribed medication and hospital contacts, and a criterion of repeated use of disease‐specific medication within 12 months was used to secure the specificity.2 However, sensitivity and specificity of the algorithms were not validated. Thus, this study aims to validate the algorithms.