It is actually the book that is required for the next 3 Biostats TICR courses but has a basic stats intro:
Regression Methods in Biostatistics by E. Vittinghoff, D. Glidden, S. Shiboski, and C. McCulloch, download free from UCSF library Springer link.
https://link.springer.com/book/10.1007%2F978-1-4614-1353-0
UCSF library has SpringerLink so downloads are free