A suicide note or death note is a message left behind when a person dies by suicide, or intends to die by suicide. A study examining Japanese suicide notes estimated that 25–30% of suicides are accompanied by a note. However, incidence rates may depend on ethnicity and cultural differences, and may reach rates as high as 50% in certain demographics. A suicide message can be in any form or medium, but the most common methods are by a written note, an audio message, or a video.