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To investigate factors associated with unscheduled admission following presentation to emergency departments (EDs) at three hospitals in England.

Cross-sectional analysis of attendance data for patients from three urban EDs in England: a large teaching hospital and major trauma centre (site 1) and two district general hospitals (sites 2 and 3). Variables included patient age, gender, ethnicity, deprivation score, arrival date and time, arrival by ambulance or otherwise, a variety of ED workload measures, inpatient bed occupancy rates and admission outcome. Coding inconsistencies in routine ED data used for this study meant that diagnosis could not be included.

The primary outcome for the study was unscheduled admission.

All adults aged 16 and older attending the three inner London EDs in December 2013. Data on 19 734 unique patient attendances …