SUMMARYThe case notes of 137 patients admitted to a psychogeriatric assessment ward over 12 months were reviewed. The characteristics of patients who were assaultive prior to, or during admission were compared with those who were not. The reported prevalence of assaultive behaviour from the case notes was compared with that from the formal 'violent incident' forms. Twenty-three per cent of the patients had assaulted others prior to their admission, and 23% were assaultive during their admission. Those patients who were assaultive prior to admission were likely to be assaultive during their admission. Assaultive behaviour prior to and during admission was associated with male gender, dementia, and increased age in female patients. Assaults were underreported on the formal 'violent incident' forms by nursing staff. Assaultive behaviour prior to admission predicted discharge to a higher dependency setting, but assaultive behaviour during admission did not. The implications of these findings are discussed.