A man wears a face mask as he looks at a COVID-19 information sign in Montreal, Sunday, Sept. 20, 2020, as the COVID-19 pandemic continues in Canada and around the world. THE CANADIAN PRESS/Graham Hughes

Preliminary B.C. study results suggest mask mandates can lower COVID-19 spread by 25%

Study has not yet been printed or peer reviewed

Preliminary results from a study conducted by Simon Fraser University researches suggests that a mask mandate can lower the transmission of COVID-19 by 25 per cent each week.

Study results, released prior to peer review on Wednesday (Oct. 7), show that mandating masks indoors nationwide in early July could have reduced new weekly cases by 25 to 40 per cent in mid-August. That would translate approximately to 700 to 1,1000 fewer cases each week.

Researchers from SFU’s economics department focused on mask mandates brought in across Ontario’s 34 Public Health Units over the course of two months this year. Results from comparing units that went to mask mandates early, versus later, showed that earlier adoption was association with an average weekly reduction of 25 to 31 per cent, in July and August. There has been no mask mandate province-wide in B.C., although many government buildings, grocery stores and other businesses have brought in mask rules of their own.

ALSO READ: B.C. records 102 new COVID-19 cases, 2 deaths

The results of SFU’s study differed from an earlier one about mask mandates in the U.S., which found a nine to 10 per cent reduction in new cases.

“One possible explanation is that Ontario’s mask policy is more comprehensive: we evaluate the effect of universal indoor mask-wearing for the public rather than the effect of mask wearing for employees only in [the U.S. study]. Differences in the compliance rate may also contribute to this difference,” researchers noted.

An analysis of mask mandates across the country found a reduction in new cases of up to 46 per cent in the first weeks after adoption. Researchers also saw that mask mandates increased self-reported use by 30 per cent.

“Jointly, these results suggest that mandating indoor mask wear in public places is a powerful policy measure to slow the spread of COVID-19, with little associated economic disruption in the short term,” the study concluded.

Researchers also looked at COVID-19 restrictions and their effect on new cases. They found that the most stringent restrictions were associated with a decrease of 48 to 57 per cent in weekly cases.

Study authors noted that while the results are significant, “their sample period does not allow them to definitively say whether the effect of mask mandates persists or weakens beyond the first few weeks after implementation.”

ALSO READ: Anti-mask protest at Kelowna schools ‘disappointing,’ says superintendent


@katslepian

katya.slepian@bpdigital.ca

Like us on Facebook and follow us on Twitter.

Want to support local journalism during the pandemic? Make a donation here.

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Just Posted

A fundraiser for the Falkland Community Church is underway. (Photo submitted)
COVID-19 leaves Falkland Church in a lurch

Annual event/major fundraiser cancelled for first time in 34 years

Advance polling saw nearly 10,000 votes cast in Vernon-Monashee. Pictured: Schubert Centre. (Jennifer Smith - Vernon Morning Star)
Almost 10,000 turn out to Vernon-Monashee advance polls

19 per cent of 52,479 registered voters have made their mark in B.C. election

Members of the Armstrong Lions Club have planted a red Canadian maple tree at Lions Park on Hunter Avenue as a show of tribute to their sister club in Banbridge, Northern Ireland. (Roger Knox - Morning Star)
Armstong Lions Club salutes sister club with tree

Red Canadian Maple planted in Lions Park pays tribute to Lions Club in Banbridge, Northern Ireland

The Community Foundation has teamed with the Canadian Mental Health Association and horse-assisted therapists to bring horse therapy to frontline worker battling the COVID-19 pandemic free of charge. (Contributed)
Okanagan organization says ‘thanks’ to COVID-19 frontline workers with complimentary horse therapy

Community Foundation teams with CMHA and equine therapists to offer unique mental health supports

COVID-19. (Courtesy of CDC).
Interior Health reports 12 additional COVID-19 cases

The total number of cases in the region is now at 644

Join Black Press Media and Do Some Good

Pay it Forward program supports local businesses in their community giving

B.C. Provincial Health Officer Dr. Bonnie Henry. (B.C. Government photo)
Kelowna Francophone school COVID-19 outbreak climbs to 5, mixture of students and staff

Health officer says situation evolving, spoke to possible closure, changes to provincial guidelines

Actor Ryan Reynolds surprised a Shuswap family with a special birthday message to their son who was worried he’d be alone on his 9th birthday on Nov. 24. (Tiffanie Trudell/Facebook)
Ryan Reynolds text almost gives away Shuswap boy’s birthday surprise

Deadpool actor helps remind eight-year-old Canoe resident he’s not alone

Colin James put on a great show at the Comox Valley Exhibition Grounds as part of the 2019 Vancouver Island MusicFest. But his Okanagan tour for 2020 has been postponed until 2021. (Photo by Terry Farrell)
COVID-19 cancels Corb Lund’s Vernon, Penticton, Trail, Cranbrook concerts

The Contenders, Colin James and Lund postponed until 2021

RCMP detachments across B.C. are now flying Pride flags. (Submitted photo)
Man who spent 4 days injured on floor rescued by Kamloops Mountie

The man is recovering in hospital after being rescued by a police officer conducting a well-being check

Vancouver police reactivated the search for Jordan Naterer Thursday Oct. 22. Photo courtesy of VPD.
Mom of missing Manning Park hiker believes her son is waiting to come home

‘He’s going to come out of a helicopter and say ‘what took you so long?”

Environment Minister George Heyman, Premier John Horgan and Energy Minister Michelle Mungall announce that B.C. Hydro is proceeding with construction of the Site C dam, Dec. 11, 2017. (Tom Fletcher/Black Press)
Site C actions, costs won’t be known until after B.C. election, Horgan says

Peace River diverted for construction of reinforced dam base

Five people with alleged ties to the Red Scorpion Gang are facing numerous charges. (Kelowna RCMP)
5 men linked to Red Scorpion gang charged with gun, drug offences in Kelowna

Police seized a machine gun as well as 5.5 kilograms of fentanyl and carfentanil

Most Read