For those who are bad at math words like I am and didn’t click through to your link, I want to note that you mean, “they cut risk to 25 percent of the original risk”, not “they reduce risk by 25 percent” :-) (I thought you meant the latter till I clicked through)
For those who are bad at math words like I am and didn’t click through to your link, I want to note that you mean, “they cut risk to 25 percent of the original risk”, not “they reduce risk by 25 percent” :-) (I thought you meant the latter till I clicked through)