RT Journal Article SR Electronic T1 Evaluation of a nudge intervention providing simple feedback to clinicians of the consequence of radiation exposure on demand for computed tomography: a controlled study JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 290 OP 293 DO 10.7861/clinmedicine.19-4-290 VO 19 IS 4 A1 Sarah Lewis A1 Ben Young A1 Peter Thurley A1 Dominick Shaw A1 Jo Cranwell A1 Rob Skelly A1 Tessa Langley A1 Mark Norwood A1 Nigel Sturrock A1 Andrew Fogarty YR 2019 UL http://www.rcpjournals.org/content/19/4/290.abstract AB Computed tomography (CT) is readily available in developed countries. As one of the side effects includes an increased risk of cancer, interventions that may encourage more judicious use of CT are important. Behavioural economics theory includes the use of nudges that aim to help more informed decisions to be made, although these have been rarely used in hospitals to date. We aimed to evaluate the impact of a simple educational message appended to the CT report on subsequent numbers of CT completed using a controlled interrupted time series design based in two teaching hospitals in the UK. The intervention was the addition of a non-directional educational message on the risk of ionising radiation to all CT reports. There was a statistically significant reduction in the number of CT requested in the intervention hospital compared to the control hospital (-4.6%, 95% confidence intervals -7.4 to -1.7, p=0.002) in the 12 months after the intervention was implemented. We conclude that a simple, non-directional nudge intervention has the capacity to modify clinician use of CT. This approach is cheap, and has potential in helping support doctors make informed decisions.