phys.org/news/2018-10-women-obese-passengers-worst-car-crash.html
A link for my statement above, and an extract.
They have made substantial progress. According to the National Highway Traffic Safety Administration, the fatality rate per 100 million vehicle miles traveled decreased 32 percent between 1994 and 2016, the last year statistics are available.
Building Women into the Equation
Now researchers are beginning to move beyond the consensus choice – the 50th percentile male – to look at other vulnerable populations, and the University of Virginia's Center for Applied Biomechanics is taking a leading role. Foremost among these groups are women. In 2011, the center's researchers published a study demonstrating that women wearing seat belts were 47 percent more likely than male seatbelt-wearers to suffer severe injury, even after controlling for age, height, weight and the severity of the crash. The discrepancy is especially pronounced for lower-extremity injuries.
"For years, we used a technique called geometric scaling to forecast how human beings of different sizes would respond to crashes," said assistant professor James Kerrigan, the Center for Applied Biomechanics' deputy director. "Not only does extrapolation not work for males, but it particularly doesn't work for females."
Among the many dissimilarities potentially affecting results are different ligament laxity and bone shape.
This may all be in the invisible women book recommended above, but I hadn’t come across it before and was shocked.