A traumatic brain injury (TBI) due to motor vehicle accidents can cause an unresponsive wakefulness state (UWS). Higashi et al. reported that in 41% of patients with a UWS, a TBI was the causative factor. Similarly, a survey in the Netherlands reported that, in 45% of patients in a UWS, a TBI was the causative factor. Progress in acute medical care has resulted in a higher incidence of survival of patients with a TBI. Coronado et al. reported that the annual mortality rates of motor vehicle-related TBI decreased significantly among vehicle occupants from 3.7 to 2.0 per 100,000 population between 1997 and 2007. Though there have been medical advances for patients in a UWS, whether they are effective remains unclear. An evaluative measure that monitors the recovery process and examines the effectiveness of treatments in patients in a UWS is therefore needed. Several scales have been developed to assess the level of consciousness. The Glasgow coma scale (GCS) and the Japan Coma Scale (JCS) are widely used to assess the level of consciousness and coma in Japan. These scales are used to classify the severity of acute consciousness disorder and determine how to treat it. The JFK Coma Recovery Scale-Revised (CRS-R) is intended for diagnosis, rehabilitation and longer-term planning, and monitoring of patient progress and treatment effectiveness.