According to the national highway traffic safety administration nhtsa percent of all pedestrian deaths in 1998 were due to pedestrian impairment?

According to the national highway traffic safety administration nhtsa percent of all pedestrian deaths in 1998 were due to pedestrian impairment?
According to the national highway traffic safety administration (NHTSA) 31 percent of all pedestrian deaths in 1998 were due to pedestrian impairment.