I want to define a ‘general population’ cohort for use with a UK primary care EHR database, where patients have a single observation period defined by registration start and end dates. I want to define cohort entry / index date as 365 days after the Observation start date. Is it possible to do this in ATLAS?
My use case is to describe incidence of a range of outcomes in several target cohorts, with the general population cohort providing context. I want to exclude the first 365 days of the observation period for all patients to reduce the chance of capturing prevalent outcomes (these may be recorded by the general practice several months after the patient first registers).