The American Osteopathic Association (AOA) Department of Education maintains historical annual data on approved, funded, and filled AOA positions, as reported by the National Matching Services (an AOA vendor) and the Trainee Information, Verification and Registration Audit (TIVRA) survey tool. The current appendix includes an update for the 2017-2018 academic year. The AOA does not finalize postdoctoral training data until May of each calendar year. The decline in the number of programs and positions is expected as programs achieve accreditation through the Accreditation Council for Graduate Medical Education and subsequently withdraw their AOA approval. For information about AOA-approved programs in light of the single accreditation system for graduate medical education, see the article from Buser et al on page 257 of this issue.