Women have less bone density and less muscle mass than men. In an equivalent physical trauma situation they are more likely to be hurt than men, as both the phy

Women have less bone density and less muscle mass than men. In an equivalent physical trauma situation they are more likely to be hurt than men, as both the physical reaction in the face of danger is less agile/powerful and the body is more fragile. Both of these apply even moreso when controlling a bicycle, because of the more direct control nuances and the greater force disparity (exposure to cars and obstacles around you).