Table 4 Adjusted relative risk for concussions during the 2006 season
VariableRelative riskp Value
Not wearing headgear2.65p<0.0001†
Female sex1.97p<0.0001†
Previous recognized concussion0.99p = 0.96‡
Previous traumatic LOC*1.44p = 0.27‡
Age at time of survey1.00p = 0.98‡
Age started organized football0.97p = 0.47‡
Years played recreational football1.00p = 0.99‡
Years played competitive/travel football0.99p = 0.87‡
Average number of headings per game1.03p = 0.54‡
Considering oneself a header1.32p = 0.16‡
Mouthguard use0.95p = 0.87‡
Playing more than 22 games1.44p = 0.12‡
Playing between 13 and 21 games1.13p = 0.48‡
  • *Loss of consciousness (after being hit in the head).

  • †Considered to be statistically significant.

  • ‡Not considered to be statistically significant.