Influenza clinical risk groups 2017 version - Asthma

Sara Thomas
Read v2 codes for diagnoses of asthma, or recording that a previous diagnosis of asthma had resolved (resolved=1). For this project, the definition was designed to follow national guidance on indications for influenza vaccination, namely: Asthma that requires continuous or repeated use of inhaled or systemic steroids or with previous exacerbations requiring hospital admission. Individuals were defined as having asthma if there was a code for asthma at any time before the index date AND...
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