Aggression on a psychiatric acute ward: a three-year prospective study.

The objectives of this 3-yr. prospective study of aggression on a Norwegian psychiatric acute ward serving a population of 170,000 were to monitor the rate and characteristics of aggressive behaviour, to identify possible interactional and situational precipitants to aggression, and to explore possible differences between aggressive and nonaggressive patients in terms of diagnosis, sex, age, numbers of admissions, admission type, and length of stay. Aggressive incidents were recorded on the Report Form for Aggressive Episodes (REFA). Severity of injuries was scored according to Fottrell's severity scale. Of the total 934 patients admitted, 98 (10.5%) accounted for a total of 981 aggressive episodes. About 55% of the aggressive incidents were assaults that resulted in 85 minor and 21 severe physical injuries. There was no evidence that diagnosis might be used to predict aggression in the clinical setting. Mean rate of admission per patient and length of stay was significantly higher in the aggressive group than in the nonaggressive group. However, several patients in the aggressive group also had admissions without being aggressive. About 13% of the aggressive patients accounted for nearly 50% of the aggressive incidents. There was no significant sex difference by total rate of aggression, but female patients tended to have higher rates of assaults and contributed to significantly more injuries than male patients. Nearly 20% of the aggressive episodes occurred during the first 24 hours of a stay and 54% during the first week. Limit setting, problems in communication, and physical contact, separately or in combinations, preceded nearly 90% of the aggressive episodes.