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Table 2 Frequencies and rates of soccer-related head injuries reported within the NCAA ISS between 2004/05 and 2008/09

From: Multifactorial examination of sex-differences in head injuries and concussions among collegiate soccer players: NCAA ISS, 2004–2009

Frequencies and rates (per 1000 AEs) of head injuries among men and women, by categories of competition level, setting and injury mechanism Frequencies and rates (per 1000 AEs) of head injuries by categories of sex, competition level, setting and injury mechanism
Explanatory variable Men
Frequency of Head Injuries (Rate per 1000 AEs)
Women
Frequency of Head Injuries (Rate per 1000 AEs)
Women vs. Men Rate Ratio [95% Wald CI] Frequency of Head Injuries (Rate per 1000 AEs) Unadjusted Rate Ratio [95% Wald CI]
Sex
 -Women n/a n/a n/a 486 (0.87)  
 -Men n/a n/a n/a 374 (0.71) 1.23 [1.08, 1.41]
Competition level
 -Division I 153 (0.71) 224 (0.89) 1.25 [1.02, 1.54] 377 (0.81)  
 -Division II & III 221 (0.71) 262 (0.86) 1.21 [1.01, 1.45] 483 (0.78) 1.03 [0.90, 1.18]
Setting
 -Game 250 (2.19) 341 (2.49) 1.14 [0.97, 1.34] 591 (2.36)  
 -Practice 124 (0.30) 145 (0.35) 1.15 [0.91, 1.46] 269 (0.32) 7.29 [6.32, 8.43]
Mechanism
 -Player-to-player contact 305 (0.58) 306 (0.55) 0.95 [0.81, 1.11] 611 (0.56)  
 -All other mechanisms 69 (0.13) 180 (0.32) 2.48 [1.87, 3.26] 249 (0.23) 2.45 [2.12, 2.84]