Table 3.  Injury rates and pair-wise comparison chi square statistic for boxing, wrestling, and martial arts.
 

Injury rates per 100,000 player-days (95% Confidence Interval)

Pearson’s chi square p-values

Injury

Boxing

Wrestling

Martial arts

Boxing vs. wrestling

Boxing vs. martial arts

Wrestling vs. martial arts

Concussions

.92 (.5-1.3)

1.20 (.8-1.5)

.07 (.03-.10)

.34

<.001*

<.001*

Contusions/ Abrasions

7.9 (6.4-9.3)

6.4 (4.8-7.9)

1.35 (1.0-1.6)

.16

<.001*

<.001*

Dislocations

1.1 (.7-1.4)

2.4 (1.7-2.9)

.23 (.1-0.3)

<.001*

<.001*

<.001*

Fractures

7.7 (6.4-8.9)

8.5 (6.5-10.4)

1.42 (1.0-1.7)

.45

<.001*

<.001*

Lacerations

2.5 (1.6-3.3)

2.4 (1.7-3.0)

.26 (.1-0.3)

.85

<.001*

<.001*

Internal organ injuries

.82 (.3-1.3)

1.02 (.6-1.3)

.11 (.07-.15)

.57

<.001*

<.001*

Strains/Sprains

5.91

14.52

1.81

<.001*

<.001*

<.001*

Total

29.0 (24.4-33.4)

39.9 (31.6-48.1)

5.8 (4.5-7.1)

.003*

<.001*

<.001*

 * statistically significant difference between the two compared groups.