Been wondering the same thing! Can add what I know about Iowa. They have an awesome MD/PhD-specific table with admissions stats for the last several years of applications:
Frequently Asked Questions | MSTP
Post-I Acceptance Rate:
Alabama: 58%; 48 interviews, 28 offers of acceptance
Colorado: 35%; 68 interviews, 24 offers of acceptance
Cornell: 50%; 90 interviews, "approximately half" (45) offers of acceptance
Georgetown: 31%; 26 interviews and 8 offers of acceptance
Stony Brook: 42-50%; 60 interviews (low estimate, 20% of 300+ apps), 25-30 offers of acceptance
University of California Irvine: 36%; 70 interviews, 25 offers of acceptance
University of Iowa: 43-61%; 41-48 interviews, 20-28 offers of acceptance (based on 2017-2020 data)
University of Maryland: 56%; 50 interviews, 28 offers of acceptance
University of Pennsylvania: 50%; 100-120 interviews, 50 offers of acceptance
University of Rochester: 13-29%; 70-80 interviews, 10-20 offers of acceptance
UT Southwestern: 15% (didn't have notes on # interviews, offers of acceptance though)
University of Virginia: 79%; 48 interviews, 38 offers of acceptance
Washington USTL: 45%; 110 interviews, 50 offers of acceptance