Table 3 Average time interval (min) between impacts and head impact frequency (#) per game, distributed by MPS magnitude level.

From: A novel repetitive head impact exposure measurement tool differentiates player position in National Football League

  

Magnitude Collapsed

Magnitude Category (MPS)

<8.0%

8.0–16.9%

17.0–25.9%

26.0–34.9%

35.0%+

 

n

 

n

 

n

 

n

 

n

 

n

QBa***b***c**

#

1.75 ± 1.72

 

0.03 ± 0.18

 

0.13 ± 0.34

 

0.69 ± 0.86

 

0.63 ± 0.91

5

0.28 ± 0.52

1

min

30.3 ± 14.65

13

–

 

—

 

53.88 ± 28.50

6

28.53 ± 19.03

30.33

WRa***b***c*

#

2.59 ± 2.28

 

0.38 ± 0.71

1

0.81 ± 0.93

 

0.66 ± 0.94

 

0.06 ± 0.25

 

0.69 ± 0.86

4

min

25.68 ± 24.18

19

47.61

29.44 ± 13.47

7

35.39 ± 25.56

5

—

 

39.42 ± 23.34

DBa***b***c*

#

2.75 ± 2.33

 

0.25 ± 0.67

2

1.03 ± 1.20

 

0.88 ± 1.10

7

0.25 ± 0.44

 

0.34 ± 0.70

2

min

24.69 ± 21.53

19

16.29 ± 23.02

37.78 ± 30.51

8

48.61 ± 38.67

 

—

 

66.68 ± 0.13

LBa***b*

#

8.91 ± 3.49

 

0.47 ± 0.72

4

5.47 ± 2.76

 

2.34 ± 1.52

 

0.53 ± 0.76

5

0.09 ± 0.30

 

min

13.16 ± 7.19

31

64.69 ± 34.08

21.21 ± 22.42

31

29.82 ± 18.31

22

43.94 ± 48.21

–

 

RBa***b**

#

10.59 ± 4.05

 

1.34 ± 1.33

10

4.06 ± 2.54

 

4.13 ± 2.17

 

0.59 ± 0.71

4

0.47 ± 0.67

3

min

13.25 ± 6.90

32

37.47 ± 19.76

32.05 ± 27.82

31

25.78 ± 14.42

27

48.90 ± 34.04

61.67 ± 37.96

TE

#

13.66 ± 6.31

 

0.22 ± 0.42

 

10.41 ± 5.47

 

2.00 ± 1.68

 

0.72 ± 0.92

6

0.31 ± 0.59

2

min

10.37 ± 5.20

32

–

 

14.77 ± 12.41

31

36.37 ± 25.68

17

32.23 ± 11.43

33.74 ± 46.53

OL

#

18.84 ± 8.33

 

0.22 ± 0.49

1

17.53 ± 8.06

 

0.97 ± 1.75

 

0.13 ± 0.34

 

—

 

min

7.81 ± 4.61

32

19.31

8.30 ± 5.91

31

24.28 ± 14.76

7

—

 

—

 

DL

#

21.19 ± 7.83

 

0.50 ± 0.67

3

19.81 ± 7.38

 

0.47 ± 0.76

 

0.41 ± 0.71

4

—

 

min

6.29 ± 2.13

32

14.25 ± 9.22

6.73 ± 2.59

32

54.99 ± 29.29

3

80.69 ± 24.80

—

 
  1. Interval per magnitude level was calculated only for games in which >2 head impacts of the respective magnitude was experienced during the same game. The number of games per position for interval calculations is indicated with n values. Averages are presented (±SD). Significance is presented for differences in interval between positions.
  2. *Significant at p < 0.05; **Significant at p < 0.005; ***Significant at p < 0.001.
  3. asignificant difference to DL, bsignificant difference to OL, csignificant difference to TE.
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