University of Oxford: Wearing face coverings protected wearers from COVID-19 infection – large scale study

Although it has been widely asserted that face coverings protect others, rather than the wearer, this large-scale study found a clear link between wearing a face covering outside the home and infection.

The study links individuals’ and households’ ability to follow non-pharmaceutical interventions (NPIs) often known as COVID behavioural interventions, using the largest and most representative dataset to date in the UK, including people from different ethnic and age groups.

Using the COVID Infection Study (CIS), study participants were asked to complete a short questionnaire, as well as taking regular COVID tests. Respondents were asked to reveal how often they worked outside the home, how easy it was to maintain social distance in their workplace, whether they took public transport and whether they had direct contact with others on a day-to-day basis.

This large-scale study found a clear link between wearing a face covering outside the home and infection

According to the study, ‘Wearing a face covering outside was a significant predictor of a lower chance of infection before mid-December 2020 in the UK, when a stricter second lockdown was implemented.’

The study found there was a higher rate of infections among those who lacked autonomy to follow COVID behavioural measures and did not comply with wearing a face covering.

Author Professor Melinda Mills says, ‘Lack of compliance to COVID behavioural measures has often been positioned as an attitude or choice. Yet there are large groups of people who, due to their household or employment circumstances, cannot follow measures to work from home, engage in physical distancing at the workplace or avoid public transportation. This, in turn, means that they have a higher exposure to becoming infected.

‘The inability for some groups of people to follow behavioural interventions exacerbates existing health inequalities and we showed that face coverings are one measure that can mitigate this unequal exposure.’

There are large groups of people who, due to their household or employment circumstances, cannot follow measures to work from home, engage in physical distancing at the workplace or avoid public transportation. This…means they have a higher exposure to becoming infected

Professor Melinda Mills

The team found, ‘The level of autonomy to adhere to behavioural interventions does not predict COVID- 19 infection alone, but rather the risk of infection is diminished when individuals wear face covering/masks.’

The study concludes, ‘Wearing a face covering or mask outside the home can reduce the unequal effects of exposure to COVID- 19 due to individual and employment circumstances.’

Professor Mills adds, ‘Using a very large individual and household sample and COVID swab tests, we showed that the inability for certain groups such as women in large households or those working in occupations where it is hard to maintain physical distancing were protected from infection during key periods in 2020 in the UK’.

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