First, I love that HN is a place where we get that kind of clarification so Thank You.
Anyway, to be pedantic 29.0% is closer to 25.0% -4% than 33.3% + 4.3%. But, it's also 'close to' 1/4, so I don't have an issue with your phrasing.
However, as you note this is 'involving' a drunk driver. So, that 29% is inflated by cases where the sober driver struck a drunk one. </ done beating a decaying equine.>
(According to the National Highway Traffic Safety Administration, 35,092 people died in traffic crashes in 2015 in the United States (latest figures available), including an estimated 10,265 people who were killed in drunk driving crashes involving a driver with an illegal BAC (.08 or greater). Among the people killed in these drunk driving crashes, 67% (6,865) were in crashes in which at least one driver in the crash had a BAC of .15 or higher.
From https://responsibility.org/get-the-facts/research/statistics...
So unless they are gravely misrepresenting the numbers, it's 29% of fatalities involving a driver with an illegal BAC.
(again not trying to argue, I'm sure there are fatalities involving alcohol that are not attributable to the impairment, just adding clarification about where my statement came from).