Mask-wearing in childcare programs is linked with fewer COVID-19–related program closures, new data released suggest.
Researchers included 6,654 childcare professionals in a prospective, 1-year, longitudinal electronic survey study of home- and center-based childcare programs in all 50 states.
Findings by Thomas S. Murray, MD, PhD, with the department of pediatrics, Yale University, New Haven, Conn., and coauthors, were published in JAMA Network Open on Jan. 28, 2022.
They found that mask-wearing from the May 22, 2020, baseline to June 8, 2020, was associated with a 13% reduction in program closures within the following year (adjusted relative risk, 0.87; 95% confidence interval, 0.77-0.99). Continued mask-wearing throughout the 1-year follow-up was associated with a 14% reduction in program closures (aRR, 0.86; 95% CI, 0.74-1.00).
The authors said the evidence supports current masking recommendation in younger children provided by the Centers for Disease Control and Prevention.
They wrote: “This finding has important public health policy implications for families that rely on childcare to sustain employment.”
The benefits of masking in preventing COVID-19 transmission within kindergarten through 12th-grade classes are well documented. Masks are particularly important in areas where vaccinations are not widespread.
Masks can be worn safely by young children without harming respiratory function, studies have shown.
William Schaffner, MD, an infectious disease expert at Vanderbilt University, Nashville, Tenn., pointed out that the American Academy of Pediatrics has said there are no noteworthy effects on breathing function for most children.
“There’s been so much discussion about the contribution of masks to reducing the risk of COVID that it’s nice to have the data,” he said, adding that this is a relationship that has been difficult to study, but this analysis was able to make the connection with hard numbers.
“It’s an important outcome,” he said in an interview.
The authors pointed out there is evidence that school-age children can identify most emotions in masked faces.
They added that “2-year-old children recognize spoken words better through an opaque mask, compared with a clear face shield, suggesting verbal communication to infants is not harmed by face masks.”
Studies have shown that childhood infection with other respiratory viruses also decreased and asthma symptoms were not reported when preschool children wore masks and used other preventative steps.
The authors wrote that a potential reason for that may be that those who wear masks have less face touching, known to increase the spread of COVID-19.
Paloma Beamer, PhD, an engineer and exposure scientist at University of Arizona, Tucson, who also has a 3-year-old son who wears masks at his daycare center, said in an interview that she works closely with his school on training kids how to wear their masks because getting young children to keep them on and finding ones that fit is challenging.
“We need layered controls and protections in place at schools as much as possible,” she said, adding that the authors didn’t mention ventilation, but that’s another important component as well.
“We’re fortunate in Arizona that we are in an old school and the windows are open as much as possible,” she said.
She said this study shows that “masks are a great form of additional control.” Her son is on his third quarantine this month after three kids tested positive, she added.
She said: “I think these newer variants perhaps make the findings of this study more compelling and it will be interesting to see if the researchers do a follow-up study.”
Strengths of the study include that it utilized prospective data from a large national cohort of childcare professionals. Additionally, the retention rate was high at 1 year. And the self-reported information likely gives better information than looking at policies that may or may not be well followed.
Limitations include potential reporting bias because the self-reports were not independently confirmed. Also, family behavior outside childcare, such as social gatherings where masking is not enforced, also influence COVID-19 cases when children gather and may affect the numbers of closures.
Having the option of childcare centers benefits kids with in-person early education and social interactions with staff, the authors noted. The centers also help parents return to work without interruptions at home.
“Our findings support current national recommendations endorsed by many local and state governments for masking children 2 years and older in childcare programs when community COVID-19 transmission levels are elevated,” the authors wrote.
Dr. Schaffner said the results have implications outside of childcare centers and should be included in discussions of masking in schools and in the general public.
All phases of this study were supported by and coauthors report grants from the Andrew & Julie Klingenstein Family Fund, Esther A. & Joseph Klingenstein Fund, Heising-Simons Foundation, W.K. Kellogg Foundation, Foundation for Child Development, Early Educator Investment Collaborative, and Scholastic. The study was partially funded by the Yale Institute for Global Health. Dr. Schaffner and Dr. Beamer reported no relevant financial relationships.