Prevalence of coma in black subjects.

Coma, commonly known as "being unconscious" or "out cold," is a state of consciousness characterized by a total inability to perceive incoming stimuli. A retrospective phenomenologic study found that 10 of 36 control, 19 of 36 precare, and 20 of 36 aftercare subjects (49 of 108, or 45.4 percent) had experienced coma at least once during their lives. The implications of these findings are discussed.