It is shown that the very large variations in the C-H and C-C homolytic bond-dissociation energies for a large variety of organic compounds can be rationalized in terms of the stabilization energies of these species and their corresponding radical(s). In most cases,these stabilization energies can be explained completely by the electronic effects of substituents without referring to steric strain.
Leroy, G., Sana, M., Wilante, C., & Nemba, R. M. (1989). Bond-dissociation energies of organic compounds. A tentative rationalization based on the concept of stabilization energy. Journal of Molecular Structure, 198, 159-173. https://doi.org/10.1016/0022-2860(89)80036-5 (Original work published 1989)