The southeast as a whole. Ballpark, probably 90% of the folks I see are in that boat. And it's not just a matter of people being lazy, of course. There's limited health literacy, lower household income, various cultural factors, limited access to healthy alternatives and resources, etc.
Also, I wouldn't say it applies to just case managers. ALL of a patient's providers can often do better in addressing these issues. A PCP may tell a patient what to do or what meds to take, and the patient may nod and say they understand, but they very well may have no idea what the medicine is, why and how they need to take it, and what will happen if they don't follow the treatment plan. So I see them, and they then tell me, "yeah, I mostly just take my bloodpressure/diabetes/depression pills when I feel like I need them," fully believing that's the optimal way to do things.
Edit: Just for the sake of fairness, I'm no saint, either. I'll see patients a year or two after my initial eval for a re-assessment and will check in on what they remember from the feedback I gave them previously. More often than not, it's little or nothing.