Have you ever wondered why research says people prefer T3 but it is not needed, yet you are so ill without it. Here is an example of research testing for people needing crutches to walk.
Testing whether crutches are of use or not. Get a bunch of people with walking difficulties, including a man with no legs. As it is very rare for someone to have no legs there were not that many to choose from and they needed an average group. Double blind test on crutches. Apart from the man with no legs the others either found they could walk with a limp just as good with the aid of a stick than on crutches, so no difference, some found they preferred to walk with crutches but they could get by without them. Only the man with no legs said they were essential to him walking. However as these studies always exclude the bottom and top figures that excludes the man with no legs. Research result comes out that people with walking difficulties prefer crutches but they are not necessary.