Table 3. Impacts to the head greater than 10g in youth Australian Football players for magnitude groups and impact location for resultant peak linear and rotational accelerations, for number of impacts recorded, impact duration and impact magnitude. Data are presented as mean (± standard deviation) and median [25th to 75th interquartile range].
n (%) Players not reporting a notable head impact Players reporting a notable head impact
Impact
Duration (ms)		 Peak Linear
Acceleration (PLA(g))		 Peak Rotational Acceleration
(PRA(deg/ s2))		 Impact
Duration (ms)		 Peak Linear
Acceleration (PLA(g))		 Peak Rotational Acceleration
(PRA(deg/ s2))
Mean ±SD Median [IQR] 95th Median [IQR] 95th n (%) Mean ±SD Median [IQR] 95th Median [IQR] 95th
PLA(g) 10.0-19.9 302 (66.7) 13.6 ±2.3 12.9 [11.0-15.3] 19.2 131,156 [77,739-195,780] 288,198 21 (80.8) 9.2 ±6.9 12.7 [11.5-16.5] 19.7 158,979 [123,524-202,535] 482,706
20.0-29.9 76 (16.8) 13.0 ±6.3 23.7 [21.5-26.0] 29.3 307,403 [235,434-394,894] 643,260 4 (15.4) 14.8 ±4.1 21.8 [21.6-25.8] - 230,306 [129,357-479,778] -
30.0-39.9 42 (9.3) 17.0 ±6.9 33.8 [32.4-36.3] 39.2 372,211 [253,093-498,995] 821,965 - - - - - -
40+ 33 (7.3) 17.3 ±8.6 49.4 [43.0-64.2] 113.6 539,205 [398,481-694,505] 902,930 1 (3.8) 10- 62.8 - 220,503 -
PRA
(deg/s2)		 <143,182 175 (38.6) 12.7 ±2.5 11.7 [10.5-13.8] 19.6 83,795 [59,095-116,517] 138,226 7 (26.9) 8.3 ±6.6 11.7 [10.9-20.7] - 100,170 [52,231-118,364] -
143,239-429,661 225 (49.7) 10.7 ±6.2 18.0 [13.7-24.4] 37.3 231,538 [188,263-298041] 391,726 17 (65.4) 9.2 ±7.6 13.6 [12.1-17.7] 59.8 186,400 [147,474-231,567] 373,282
429,718-716,140 40 (8.8) 16.8 ±8.3 37.8 [27.8-48.9] 106.5 539,033 [481,113-605,250] 698,974 2 (7.7) 12.5 ±0.7 20.5 - 454,189 -
716,197+ 13 (2.9) 17.0 ±8.9 37.8 [28.0-54.8] - 846,219 [775,716-910.969] - 0 - - - - -
HITSP <21 333 (73.5) 7.8 ±6.5 13.3 [11.1-16.7] 21.6 140,610 [81,744-209,519] 323,228 23 (88.5) 9.4 ±6.9 13.2 [11.7-17.0] 24.9 154,750 [118,637-199,607] 471,063
21-43 92 (20.3) 15.0 ±6.6 30.3 [25.2-34.8] 44.9 350,272 [264,827-469,338] 776,879 2 (7.7) 16.0 ±5.7 24.8 - 376,932 -
43-63 19 (4.2) 20.7 ±8.3 47.3 [40.5-54.5] 62.1 661,199 [459,163-709,958] 895,894 - - - - - -
>63 9 (2.0) 20.4 ±9.4 81.6 [66.0-109.3] - 584,670 [463,523-768,783] - 1 (3.8) 10- 62.8 - 220,503 -
RWECP .<2499 414 (91.4) 9.3 ±7.2b 14.2 [11.6-20.3] 35.8 163,883 [93,770-258,983] 398,051 26(100) 9.3 ±7.0a 13.5 [12.0-18.4] 49.9 164,851 [123,175-226,032] 519,593
.2500-.4999 12 (2.6) 17.5 ±8.4 37.0 [28.1-40.5] - 552,939 [536,873-564,398] - - - - - - -
.5000-.7499 7 (1.5) 19.8 ±8.3 35.1 [32.2-87.1] - 612,108 [517,994-634,648] - - - - - - -
.7500+ 21 (4.6) 17.7 ±9.1 48.5 [34.2-63.3] 116.4 765,357 [668,298-868,335] 1,228,055 - - - - - -
SD = Standard Deviation; ms = milliseconds; IQR = interquartile [25th-75th] percentile; 95th = 95th percentile; Significant difference (p < 0.05) than (a) = Injured; (b) = Non-Injured