that obliquely refer to “increased chances of contracting X” without stating what the general baseline occurrence of X is.
For example, this list shows the odds of an event occurring, but does not factor in prerequisites. It shows the odds of getting a “hole in one” at 1 in 5000. However if you never have or never will play golf, your odds of getting that hole in one are precisely zero. Simply playing the game dramatically increases your odds.