• F C Sherratt, B S R Allin, J J Kirkham, E Walker, B Young, W Wood, L Beasant, Appendicitis Core Outcome Set Study Group, S Eaton, and N J Hall.
• Institute of Population Health Sciences, University of Liverpool, Liverpool, UK.
• Br J Surg. 2020 Jul 1; 107 (8): 1013-1022.

BackgroundResearch studies to inform clinical practice and policy in children and young people with appendicitis are hampered by inconsistent selection and reporting of outcomes. The aim of this study was to develop a core outcome set for reporting all studies of uncomplicated acute appendicitis in children and young people.MethodsSystematic literature reviews, qualitative interviews with parents and patients treated for uncomplicated acute appendicitis, and a Study-Specific Advisory Group informed a long list of outcomes. Outcomes were then prioritized by stakeholders based in the UK (patients, parents, and paediatric and general surgeons) in an online three-round Delphi consensus process, followed by face-to-face consensus meetings.ResultsA long list of 40 items was scored by 147 key stakeholders in the first Delphi round, of whom 90 completed the two subsequent Delphi rounds. The final core outcome set comprises 14 outcomes: intra-abdominal abscess, reoperation (including interventional radiology procedure), readmission to hospital, bowel obstruction, wound infection, antibiotic failure, wound complication, negative appendicectomy, recurrent appendicitis, death, patient stress/psychological distress, length of hospital stay, time away from full activity and child's quality of life.ConclusionA core outcome set comprising 14 outcomes across five key domains has been developed for reporting studies in children and young people with uncomplicated acute appendicitis. Further work is required to determine how and when to measure these outcomes.© 2020 The Authors. BJS published by John Wiley & Sons Ltd on behalf of BJS Society Ltd.

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