Original sentence: For example, this study by the NHTSA found that seat belts save over 10,000 lives every year in the US.Many studies have found on the contrary that seat belt legislation has helped reduce the number of casualties in road accidents
Edited sentence: 4 years after this, in 1974 statistics, a decrease of 37% has been observed in deaths, and a decrease of 41% in injuries and a decrease of 27% in spinal injuries have been observed.As such this was a time when traffic injuries and deaths fell in most industrialised countries.For example, this statistical analysis by the NHTSA found that seat belts save over 10,000 lives every year in the US.However much of these claims have been criticised over the methodology used.However, critics of seat belt legislation have pointed out that the Victorian legislation coincided with the oil-crisis of the early 1970s.In Victoria, a state of Australia, use of seat belts has become obligatory in 1970.In many cases the estimates of lives saved are obtained by simply extrapolating experimentally derived estimates for seatbelt effectiveness to the entire population based on recorded seat belt use and recorded crash rates.Indeed, Victoria's death rates may have remained above the trends seen in juridisctions without seat belt legislation.Many researchers have claimed to have found that seat belt legislation has helped reduce the number of casualties in road accidents.This cannot of itself provide evidence of actual reductions in overall deaths that might be reasonably attributed to seat belts