A statistical analysis of seat belt effectiveness in 1973-75 model cars involved in tow-away crashes
- Published: DOT HS 802 035, 1976
- Authors: Donald W. Reinfurt, Claudio Z. Silva, Andrew F. Seiva
- Date Added: 01 Feb 2013
- Last Update: 01 Feb 2013
To calculate an accurate assessment of the effectiveness of seat belts at preventing injury by overcoming several of the data collection issues which biased previous results.
Detailed information was collected on over 15,000 towaway accidents involving 1973-75 model passenger cars from 5 sites in theUSA. Standardised injury rates were calculated, and compared in order to establish seat belt effectiveness. Confounding variables between the groups were corrected in the statistical analyses
The study examined the effectiveness of seat belts at preventing injuries which were judged to be ‘moderate’ severity and above.
Compared with unrestrained occupants, using a lap belt reduced the injury rate by 31%.
In frontal impacts the rate was reduced by 23%, and in side impacts it was reduced by 40%.
Compared with unrestrained occupants, using a three point belt reduced the overall injury rate by 56.5%.
In frontal impacts the rate was reduced by 53%, and in side impacts it was reduced by 59%.