Are women more at risk in Car CRASHES?
The anatomy of women is different than men hence the effect of seatbelts is different.
The dummies historically were a medium size males for most research and design.
Note here that the focus on prevention is POST-CRASH, which is the other end of the spectrum of DRIVER TRAINING which is PRE CRASH. POST-CRASH prevention is big money.
This problem has changed over the years and a variety of different dummies are now used in crash prevention research.