Which of the following kinds of information is generally acceptable to share as long as the person is not identified?

Sharing information that does not identify an individual is a key principle in maintaining privacy and confidentiality, particularly in healthcare and personal data contexts. A preferred hobby falls within this acceptable category because it is general information that does not lead to the identification of an individual. For example, knowing someone enjoys hiking does not reveal who they are and can be shared without compromising their anonymity.

In contrast, treatment plans, the year a person was born, and medical histories are more sensitive. A treatment plan might contain specifics about an individual's care that, if disclosed, could reveal their identity linked to their health conditions. Similarly, while the year someone was born seems innocuous at first glance, it can still narrow down the potential identity of the person, especially in conjunction with other shared data. Medical histories are typically protected under privacy regulations because they can directly relate to an individual's health conditions and thus are not acceptable to share if not anonymized.

Thus, a preferred hobby stands out as the safest type of information to share without leading back to the identification of an individual.