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Of 135 patients on an acute psychiatric ward, 34 were "high users" of coffee. The high users tended to be older, single, and have diagnoses of psychosis. They showed significantly more state anxiety than other patients, but there were no differences in trait anxiety or MMPI scores. Further research is suggested to determine whether high caffeine consumption among inpatients may be related to staff coffee- drinking behavior and/or treatment with anticholinergic drugs.
A Wed, study studied this question.