But these studies also categorized their on-field findings as “preliminary” and “pilot,” respectively, in part due to the obvious small sample sizes. Here again, Biocore, backed by the NFL, is leading the way: According to Bailey Good, a paper unpacking the Guardian Caps’ effect in their first two years of preseason practice use—in particular the league’s touted 50 percent drop in concussions among linemen, tight ends, and linebackers, from an average of 35 in 2018, 2019, and 2021 to 18 during this last postseason—was submitted “a few months ago” and is currently being peer reviewed.
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