query: How many people have PCS after a concussion?
passage: Post-concussion syndrome
Post-concussion syndrome, also known as postconcussive syndrome or PCS, is a set of symptoms that may continue for weeks, months, or a year or more after a concussion– a mild form of traumatic brain injury (TBI).[1][2][3] The rates of PCS vary, but most studies report that about 15% of individuals with a history of a single concussion develop persistent symptoms associated with the injury. A diagnosis may be made when symptoms resulting from concussion last for more than three months after the injury.[4][5] Loss of consciousness is not required for a diagnosis of concussion or post-concussion syndrome.[6]
passage: Concussions in sport
Concussions are also a significant factor in rugby union, another full-contact sport. In 2011, the sport's world governing body, World Rugby (then known as the International Rugby Board, or IRB), issued a highly detailed policy for dealing with injured players with suspected concussions. Under the policy, a player suffering from a suspected concussion is not allowed to return to play in that game. Players are not cleared to play after the injury for a minimum of 21 days, unless they are being supervised in their recovery by a medical practitioner. Even when medical advice is present, players must complete a multi-step monitoring process before being cleared to play again; this process requires a minimum of six days. In 2012, the IRB modified the policy, instituting a Pitchside Suspected Concussion Assessment (PSCA), under which players suspected of having suffered concussions are to leave the field for 5 minutes while doctors assess their condition via a series of questions. Players who pass the PSCA are allowed to return to play.