CRP and injury: HBOT has been shown, previously, to reduce CRP concentration in people with traumatic brain injury treated with 4 hyperbaric oxygen treatments at 3-day intervals (1 h on 100% oxygen at 2.0 ATA) (5), and in children with autism after 40 hyperbaric oxygen treatments at 1- to 2-day intervals (45 min on 100% oxygen at 1.3 and 1.5 ATA) (37).