It's 7 years to possible board certification, not 7 years to technically be able to practice independently (albeit not finishing residency is a pretty crappy option). It does seem that physician education is easily at the top as far as standardization in training out of doctoral-level clinical education programs. Post-training, I think physicians are also toward the top in self-regulation. Dentists/pods are probably tied or very close in both. Psychology is looser (on the whole), but I think the majority of clinical psych programs produce competent independent practitioners. Public health isn't a clinical degree, and it is essentially without biomedical education. You were pretty vague about what you were asking about that you feel a public health phd should be knowledgeable of, and public health offers both general and specialized training routes.
👍. I think, eventually, malpractice rates should provide a gauge of new independent practitioners. I would say reimbursement rates for other practitioners relative to physicians should eventually provide some measure of efficacy of care, but to my knowledge, some wacky things still get reimbursed, so not so sure about that. It would be nice if quality studies could be produced, but the best to my knowledge is the anesthesia care team vs independent physician vs independent crna study, and even that, while producing much more expectable results than the nurse-funded studies, was still biased in the set up toward demonstrating equal competency
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At any rate, I think a fight to get physicians as the sole "doctor" in clinical settings is an fight with too much going against it. A push for all introductions to be followed by an established explanation of role in treatment is a much more feasible avenue to pursue.