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Table 5 History of previous concussion and incident concussion rate

From: Epidemiology of sports-related concussion in seven US high school and collegiate sports

Number of previous concussions within the past 24 months No. of incident concussions Athlete-exposures Rate per 100,000 athlete-exposures 95 %CI CLR Rate ratio 95 %CI CLR
None 247 1,228,161 20.1 17.6, 22.6 1.3 1.0 (reference) ––
1 90 174,923 51.5 40.8, 62.1 1.5 2.6 2.0, 3.3 1.6
2 or more 38 34,147 111.3 75.9, 146.7 1.9 5.5 3.9, 7.8 2.0
  1. CI confidence interval, CLR confidence limit ratio