I don't think burnout is well defined at all - at least not as used colloquially. As I understand it there's a specific medical/ mental health condition called

I don't think burnout is well defined at all - at least not as used colloquially. As I understand it there's a specific medical/ mental health condition called burnout that is pretty horrendous. But in everyday usage it can mean everything from that medical definition to "I've had a rough week". I don't see any reason to assume which end of that scale a survey respondent might be thinking of when they answer.