Temporal trends in the accuracy of hospital diagnostic coding for identifying acute stroke: A population-based study

Administrative hospital diagnostic coding data are increasingly being used in identifying incident and prevalent stroke cases, for outcome audit and for 'big data' research. Validity of administrative coding has varied in previous studies, but little is known about the temporal trends of coding accuracy, which could bias analyses.Using all incident and recurrent strokes in a population-based cohort (Oxford Vascular Study/OXVASC) with multiple...