RT Journal Article SR Electronic T1 Effects and costs of implementing predictive risk stratification in primary care: a randomised stepped wedge trial JF BMJ Quality & Safety JO BMJ Qual Saf FD BMJ Publishing Group Ltd SP 697 OP 705 DO 10.1136/bmjqs-2018-007976 VO 28 IS 9 A1 Helen Snooks A1 Kerry Bailey-Jones A1 Deborah Burge-Jones A1 Jeremy Dale A1 Jan Davies A1 Bridie Angela Evans A1 Angela Farr A1 Deborah Fitzsimmons A1 Martin Heaven A1 Helen Howson A1 Hayley Hutchings A1 Gareth John A1 Mark Kingston A1 Leo Lewis A1 Ceri Phillips A1 Alison Porter A1 Bernadette Sewell A1 Daniel Warm A1 Alan Watkins A1 Shirley Whitman A1 Victoria Williams A1 Ian Russell YR 2019 UL http://qualitysafety.bmj.com/content/28/9/697.abstract AB Aim We evaluated the introduction of a predictive risk stratification model (PRISM) into primary care. Contemporaneously National Health Service (NHS) Wales introduced Quality and Outcomes Framework payments to general practices to focus care on those at highest risk of emergency admission to hospital. The aim of this study was to evaluate the costs and effects of introducing PRISM into primary care.Methods Randomised stepped wedge trial with 32 general practices in one Welsh health board. The intervention comprised: PRISM software; practice-based training; clinical support through two ‘general practitioner (GP) champions’ and technical support. The primary outcome was emergency hospital admissions.Results Across 230 099 participants, PRISM implementation increased use of health services: emergency hospital admission rates by 1 % when untransformed (while change in log-transformed rate ΔL=0.011, 95% CI 0.010 to 0.013); emergency department (ED) attendance rates by untransformed 3 % (while ΔL=0.030, 95% CI 0.028 to 0.032); outpatient visit rates by untransformed 5 % (while ΔL=0.055, 95% CI 0.051 to 0.058); the proportion of days with recorded GP activity by untransformed 1 % (while ΔL=0.011, 95% CI 0.007 to 0.014) and time in hospital by untransformed 3 % (while ΔL=0.029, 95% CI 0.026 to 0.031). Thus NHS costs per participant increased by £76 (95% CI £46 to £106).Conclusions Introduction of PRISM resulted in a statistically significant increase in emergency hospital admissions and use of other NHS services without evidence of benefits to patients or the NHS.