CDC Buries Study Finding That Student Masking Has ‘No Statistically Significant Benefit’

Less than three months ago, the Centers for Disease Control published a mostly-ignored, large-scale study of Covid-19 transmission in US schools which concluded that while masking then-unvaccinated teachers and improving ventilation was associated with lower levels of virus transmission in schools – social distancing, classroom barriers, HEPA filters, and forcing students to wear masks did not result in a statistically significant benefit.

According to the report, scientists believe that the CDC’s decision to intentionally omit the findings on student masking from a summary of the study amounts to “file drawering” the findings – the practice of burying studies that don’t have statistically significant results.

“That a masking requirement of students failed to show independent benefit is a finding of consequence and great interest,” according to Vinay Prasad, an associate professor in University of California, San Francisco’s Department of Epidemiology and Biostatistics. “It should have been included in the summary.”

Epidemiologist Tracy Hoeg, author of a different CDC study on Covid-19 transmission in schools said that “The summary gives the impression that only masking of staff was studied,” adding “when in reality there was this additional important detection about a student-masking requirement not having a statistical impact.”

Meanwhile, as we’ve noted a few times in the past week, there are plenty of studies which conclude that masks provide minimal to no protection. 

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