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in 2018, a study published in the annals of neurology found that each year an athlete played tackle football before age 12 predicted earlier onset of cte symptoms by an average of two and a half years, but there was no association with symptom severity.
it’s not just the nfl however. a 2015 study revealed 35 nhl players between 1995 – 2014 whose careers were cut short due to concussions to the total cost of $117,191,045. the player with the most concussions was dean chynoweth of the boston bruins with 13.
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another sport with relatively recent implications for concussions is soccer , through the repeated heading of the ball. there are ongoing discussions on when to introduce heading to children’s soccer and even what ball size should be used.