63% of teams in the study received outside funding (that is of the 100% of companies that went through the program).  69% (of the 100% again) were still in business five years later.  You could estimate from these numbers.  Here is the full study chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://entrepreneurship.mit.edu/wp-content/uploads/delta-v-impact-study.pdf
But specific to VC-backed, I don’t think we have that.  I will get the study’s lead, Daniela Ruiz Massieu, to weigh in to give you the more complete answer here.