Disabilities caused by road traffic accidents and their relation to severity scores.

The disabilities incurred by 2502 road accident patients admitted in three separate years to an Accident Hospital have been analysed. There were about equal numbers of disabled among pedestrians, motorcyclists and vehicle occupants. This corresponds to the high relative frequency and severity of injuries among motorcyclists. Most of the serious disabilities were caused by head or lower limb injuries. Different severities of disability were not closely correlated with Abbreviated Injury Scale (AIS), (ISS) or (PI) scores or with treatment periods but useful threshold values are described which separate groups with high and low rates of disability. For given severities of injury, disabilities were less severe among young casualties. Comparisons with other studies show rather wide variations in estimates of the incidence of slight disabilities. There is fair agreement with the present findings that serious disabilities occur in about 3% of inpatient hospital cases or in about 1% of total casualties.