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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Ann Neurol. 2018 May;83(5):886–901. doi: 10.1002/ana.25245

Figure 3. Relationship between Age of First Exposure to Tackle Football and Age of Behavioral/Mood Symptom Onset in 211 Tackle Football Players with CTE.

Figure 3.

Left Figure is a scatter plot of the relationship between age of first exposure (AFE) to tackle football and age of behavioral/mood symptom onset. Bivariate correlation tested this relationship and it was statistically significant (r=0.33, p<0.001). The right Figure presents a bar graph comparing the average age of behavioral/mood symptom onset in participants who began playing tackle football before age 12 and those who began playing at 12 or older. Independent samples t-tests showed this to be a significant difference (p<0.001). Error bars are 95% confidence intervals.