I believe confidentiality refers to sharing details about the study as it relates to individuals, privacy relates to sharing personal details about a participant, and anonymity refers to sharing identifiable details.
Examples
Confidentiality breach: patient X reacted badly to the study and gained a disfiguring disability.
Privacy beach: patient X is a married straight white suburban male.
Anonymity breach: patient X is Steve Rogers and he is also Captain America.
I believe confidentiality refers to sharing details about the study as it relates to individuals, privacy relates to sharing personal details about a participant, and anonymity refers to sharing identifiable details. Examples Confidentiality breach: patient X reacted badly to the study and gained a disfiguring disability. Privacy beach: patient X is a married straight white suburban male. Anonymity breach: patient X is Steve Rogers and he is also Captain America.