Well, the 0 - 6 year school I went to had about a 50% attrition rate my first year. This was decades ago. I think my class set a school record at that time for highest attrition rates of a 1st year class. I can tell you though, 90% of those who didn't come back, didn't come back because they spent the *entire* year partying.
As others have said, I wouldn't worry about the attrition rate & Far more important is the board passage rate (NABPLEX.) It doesn't matter if the school is easy to graduate from, if you end up flunking & having to retake the board....perhaps more than once. Look at it this way, schools *want* to keep their paying students, they will usually work with them, as long as the student is willing & there is any hope they might eventually pass. There were students in my class who were strung along far pass the point they should have flunked out......taking on a lot of extra debt, and never getting the degree. Far better to find out first year that you can't do the work, and to flunk out, instead of spending 2 - 3 or more years getting debt without any degree.