“How bad are school vouchers for students? Far worse than most people imagine. Indeed, according to the analysis conducted by the authors of this report, the use of school vouchers—which provide families with public dollars to spend on private schools—is equivalent to missing out on more than one-third of a year of classroom learning. In other words, this analysis found that the overall effect of the D.C. voucher program on students is the same as missing 68 days of school.”
https://www.americanprogress.org/…/highly-negative-impacts…/