Press release: Risk factors for COVID-19 death revealed in world’s largest analysis of patient records to date
- Largest study to date, analysing NHS health data from 17.4 million UK adults between 01 February 2020 and 25 April 2020, has given the strongest evidence to date on risk factors associated with COVID-19 death.
- Among the 17.4 million adults in the sample, there were 5,707 deaths in hospitals attributed to COVID-19.
- People of Asian and Black ethnic backgrounds are at a higher risk of death and, contrary to prior speculation, this is only partially attributable to pre-existing clinical risk factors or deprivation.
- Key factors related to COVID-19 death included being male, older age, uncontrolled diabetes and severe asthma.
- A deprived background was also found to be a major risk factor: this was also only partially attributable to other clinical risk factors.
Academics at the University of Oxford and the London School of Hygiene & Tropical Medicine (LSHTM), working on behalf of NHS England, and in partnership with NHSX, have analysed the pseudonymised health data of over 17.4 million UK adults to discover the key factors associated with death from COVID-19.
This is the largest study on COVID-19 conducted by any country to date, and therefore gives the strongest evidence on risk factors associated with COVID-19 death.
Compared to white people, people of Asian and Black ethnic origin were found to be at a higher risk of death. Previously, commentators and researchers have reasonably speculated that this might be due to higher prevalence of medical problems such as cardiovascular disease or diabetes among BME communities, or higher deprivation. Our findings, based on more detailed data, show that this is only a small part of the excess risk. Consequently, further work must be done to fully understand why BME people are at such increased risk of death. . Additionally, people from deprived social backgrounds were also found to be at a higher risk of death: again, this finding could not be explained by other risk factors.
Results confirmed that men are at increased risk from COVID-19 death, as well as people of older ages and those with uncontrolled diabetes. People with more severe asthma were also found to be at increased risk of death from COVID-19.
The study linked data about patients that had been hospitalised with Covid-19 with data held in primary care records processed by TPP. This was carried via the OpenSAFELY analytics platform, a new secure mechanism which allowed the GP records to be linked where they are stored for individual care. This minimises the security risks associated with transferring and storing data elsewhere, to deliver analyses quickly and safely while preserving patient privacy. All identifiable data remains in control of the NHS and data is pseudonymised before it can be accessed by researchers.
Professor Liam Smeeth, Professor of Clinical Epidemiology at LSHTM, NHS doctor and co-lead on the study, says: ‘We need highly accurate data on which patients are most at risk in order to manage the pandemic and improve patient care. The answers provided by this OpenSAFELY analysis are of crucial importance to countries around the world. For example, it is very concerning to see that the higher risks faced by people from BME backgrounds are not attributable to identifiable underlying health conditions’.
Dr Ben Goldacre, Director of the Bennett Institute for Applied Data Science in the Nuffield Department of Primary Care Health Sciences at the University of Oxford, NHS doctor and co-lead on the study, says: ‘During a global health emergency we need answers quickly and accurately. That means we need very large, very current datasets. The UK has phenomenal coverage and quality of data. We owe it to patients to keep their data secure; and we owe it to the global community to make good use of this data. That’s why we have developed a new highly secure model, taking the analytics to where the data already resides.’
Further analyses using OpenSAFELY are already underway, including investigation into the effects of specific drugs routinely prescribed in primary care. The platform can also be used to evaluate COVID-19 spread with innovative approaches to modelling; predict local health service needs; assess the indirect health impacts of the pandemic; track the impact of national interventions; and inform exit from lockdown.
This paper is being released prior to peer review, as with most other research into COVID-19. After embargo the full paper (attached) will be available to view online, please use this link when referring to the paper: https://doi.org/10.1101/2020.05.06.20092999.
Notes to editors:
Research in the public interest to deepen our understanding of the Covid-19 virus and inform the Government’s response is supported by the COPI notices and is in accordance with data protection law. Studies such as this require ethical approval to proceed. Primary care data is not held in the NHS Covid-19 data store therefore this important research was carried out i with the support of TPP, one of the main GP system suppliers. Pseudonymised data was accessed by the academics for the research under strict controls. No identifiable data can be extracted from the platform. For further information, a copy of the analysis, or interview requests, please contact Gen Juillet, Media Relations Manager, [email protected]
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