Years Professional Play¹

Adjusted Professional Years

Adjusted Years of Head Impact²

Hazard Ratio¹

Risk

%

Predicted Risk %

0

0

0

1.00

1.6

1.7

< 5

3

7

2.26

3.6

3.3

6-10

8

12

4.61

7.4

5.1

11-15

13

17

4.28

6.8

7.5

> 15

17

21

5.20

8.3

10.0