To evaluate the Sex differences in Sport-related Concussion in Japan.

We dont't have the knowledge about the sex differences in SRC in Japan.

The study design was retrospective study. Facility is Toho University Ohashi Medical Center Neurosurgery Sports-related head injury clinic. The search period is April 2017 to February 2018. Inclusion criteria were as follows: 1) Sports-related head injury cases, 2) Physician-diagnosed Sports-related concussion, 3) Underwent evaluation by the same neurosurgeon, 4) More than 28 days continued follow-up. The following items were compared male and female. The examination items were as follows: 1) Age/sex, 2) competition item, 3) prior concussion, 4) Migraine history, 5) persistent post concussive symptoms. Statistical analysis used t test.

The 140 selected cases were 114 male (Group M: GM) and 26 female (Group F: GF). The mean Age of both GM and GF was 20 years. The most majority competition item of GM was Rugby football. On the other hand, GF was lacrosse. 42 cases of GM and 9 cases of GF suffered prior concussion (p> 0.05, no significant).  19 cases of GM and 6 cases of GF had migraine history (p> 0.05, no significant). 37 cases of GM and 16 cases of GF had PPCS (p< 0.05).

Our result suggests that female players explain the significant difference in the prevalence of PPCS in Japan.