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. 2017 Nov 21;17:616–627. doi: 10.1016/j.nicl.2017.11.013

Table 1.

Various demographics of all the participants are shown along with their mean ± SD. Results of pairwise statistical comparisons are also shown with their respective p-values. p-Values are represented by the letter “p”. NS: Non-significant; NA: Not applicable.

Demographics Control (N = 19) Fighters (N = 214) Control vs fighters
Age (years) 29 ± 7.53 28.98 ± 5.86 NS (p = 0.95)
Years of education (years) 14.59 ± 2.67 13.71 ± 2.47 NS (p = 0.11)
Race
 Unknown: 2 30
 Pacific Islander: 2 8
 Asian: 1 3
 African American: 1 56
 American Indian/Alaskan Native: 0 3 NS (p = 0.15)
 White: 13 100
Number of professional fights NA 12.69 ± 12.16 NA
Years of professional fights NA 5.18 ± 4.03 NA
Number of knockouts NA 0.91 ± 1.53 NA