30 June 2021
Using the full pseudonymised GP records of 57.9 million patients in England, researchers at Oxford University and the London School of Hygiene and Tropical Medicine have found that formally recorded diagnoses of Long COVID are substantially lower than previous survey estimates for the same condition. This finding raises important questions about how Long COVID is diagnosed, recorded, and managed in the NHS.
Numerous recent studies have used questionnaire research methods to determine the prevalence of Long COVID, with the most recent estimates suggesting that approximately 2 million people have the condition (REACT2) and that between 7.8% and 17% of COVID patients experience symptoms for more than 12 weeks (National Core Studies Programme).
By contrast, for a study published today in the British Journal of General Practice, the research team ran an analysis across the full electronic health records of 57.9 million patients in England, in order to identify all those with a diagnostic code for Long COVID entered by their GP. They found only 23,273 cases ever formally recorded between February 2020 and April 2021, in a sample covering 96% of the population. Cases ranged from 20.3 per 100,000 people in the East of England, to 55.6 per 100,000 in London, with 52.1 cases per 100,000 women compared with 28.1 cases per 100,000 men. Interestingly, levels of reporting also varied greatly between GP practices, and with the type of computer-based systems used by GPs to record patient information.
The researchers speculate in the paper that this significant discrepancy between survey data and patient records may be attributable to a range of possible factors including: patients not yet presenting to primary care with Long COVID; different clinicians and patients holding different diagnostic thresholds or criteria for using the diagnosis; and issues around how the diagnosis is being recorded in computer systems.
Lead researcher Dr Ben Goldacre from the University of Oxford’s Nuffield Department of Primary Care Health Sciences, said: ‘We were very surprised to see almost a hundred-fold difference in prevalence between population survey estimates and formally recorded diagnoses for the same condition. Good data on Long COVID will be crucial for research into the prevalence of Long COVID, its causes and consequences, and to plan services effectively.
'Since initially publishing a pre-print of this research in May, we have taken our findings to the National Institute for Health and Care Excellence (NICE), NHS England, and GP software systems designers and have had extensive conversations about how to address the issues highlighted by this research.’
Long COVID is an emerging condition that has been broadly defined as a continuation of the symptoms of COVID-19 for more than 4 weeks. Reported symptoms vary, but commonly include breathlessness, headaches, cough, fatigue, and cognitive impairment or ‘brain fog’. Beyond this, relatively little is known about the condition, with doctors and researchers working quickly to better understand it. As a result of this uncertainty, it has been challenging to issue clinical guidelines, create and communicate new diagnostic codes for use in GP computer systems, and communicate the current evidence relating to the condition to doctors.
This is the first study to be published in a journal using the expanded OpenSAFELY platform, which is now running analyses securely across the full electronic health records of 57.9 million patients, 96% of the English population. OpenSAFELY is a new and highly secure data analysis software platform created by Oxford researchers working on behalf of NHS England during the COVID-19 pandemic. It was built specifically to address privacy concerns around access to patient records for research. OpenSAFELY is the first service ever to run research analyses across the full GP records of almost the whole population.
The research was jointly funded by UK Research and Innovation, the National Institute for Health Research, Asthma UK-BLF and the National Core Studies programme. The OpenSAFELY platform is funded by the Wellcome Trust.
Notes to editors:
For more information and interview requests, contact Dr Ben Goldacre, lead researcher, email@example.com
OpenSAFELY is a new and highly secure software platform built during the COVID-19 pandemic for safe analysis of electronic health records data, covering 57.9 million patients in England. It was specifically built to address concerns around patient privacy when doing large scale research with patient records. Analysts write code in OpenSAFELY to answer important research questions without needing direct access to the underlying patient records; all code is shared automatically for other researchers to review and re-use; and all platform activity is publicly logged. This secure and transparent approach to using medical data has received strong support from privacy advocates, including in parliament, and from an independent Citizens’ Jury on data sharing during COVID-19 commissioned by NHSx and the National Data Guardian. OpenSAFELY is a collaboration between the DataLab at the University of Oxford, the Electronic Health Records Research Group at London School of Hygiene and Tropical Medicine, and electronic health record software suppliers TPP and EMIS, with NHS England acting as data controller. More information is available at OpenSAFELY.org.
About the University of Oxford
Oxford has been placed number 1 in the Times Higher Education World University Rankings for the fifth year running, and at the heart of this success is our ground-breaking research and innovation. Oxford is world-famous for research excellence and home to some of the most talented people from across the globe. Our work helps the lives of millions, solving real-world problems through a huge network of partnerships and collaborations. The breadth and interdisciplinary nature of our research sparks imaginative and inventive insights and solutions.
Oxford University’s Medical Sciences Division is one of the largest biomedical research centres in Europe, with over 2,500 people involved in research and more than 2,800 students. The University is rated the best in the world for medicine and life sciences, and it is home to the UK’s top-ranked medical school. It has one of the largest clinical trial portfolios in the UK and great expertise in taking discoveries from the lab into the clinic. Partnerships with the local NHS Trusts enable patients to benefit from close links between medical research and healthcare delivery.
Within the division, the Nuffield Department of Primary Care Health Sciences is the largest, top-ranked centre for academic primary care in the UK and leads world-class research and training to rethink the way healthcare is delivered in general practice and other primary care settings. The department’s main research focus is on the prevention, early diagnosis and management of common illness, bringing together academics from many different backgrounds to work together to produce benefits for the NHS, for populations and for patients. www.phc.ox.ac.uk