There are many reasons for the above statistics including, predators, parasites, diseases, and cars. Dogs, coyotes, raccoons and owls all prey on cats outdoors. Indoor cats have less of a chance to contract parasites, such as fleas, ringworm, tapeworms, and coccidia, than do outdoor cats. Exposure to disease, such as FIV, FIP, and FELV is more likely with outdoor cats, and without regular vaccinations, recovery or remission is unlikely.
Cats tend to freeze in front of car headlights resulting in being hit.
Cat's have also been killed when a car is started after trying to keep warm by climbing into the engine area. Cats cannot be disciplined the same as you would Dogs. Dogs form social hierarchies of which the owners can take advantage. Cats, however, form social groups only by necessity, and the arrangement is territorial. Cats hate to be surprised, so you can use waterbottles, clapping, hissing, or other sudden noises to stop unwanted behavior.