World records in disability athletics are ratified by the International Paralympic Committee (IPC). In Para-athletics competitions, athletes are given a class depending on the type and extent of their disability. The classes are as follows:11–13: Blind and visually impaired 20: Intellectually disabled 32–38: Athletes with cerebral palsy; classes 32–34 compete in wheelchairs, while 35–38 are ambulant 40–46: Ambulant athletes with amputations or other disabilities such as dwarfism 51–58: Wheelchair athletes with spinal cord injuries or amputations 61–64: Athletes with limb differences