I Don't Understand Your Categories
If you want to assemble some data (dubious due to self-selection of respondents), it seems to me that it would have made more sense either to ask for total number of years of formal education or group the post-high-school stuff as associate, bachelor, master, professional doctorate (e.g., MD, JD, etc.) and academic doctorate (e.g., PhD, DSc, etc.). There are plenty of other professional doctorates, particularly in health care, which are not listed, leavng respondents to guess whether they should list themselves with the ones you have listed or with other unspecified graduate degrees.