An increase in violence on an acute psychiatric ward. A study of associated factors.

The increase in violent incidents on an acute psychiatric ward over a 15-month period was found to be strongly associated with the increase in use of temporary nursing staff (r = 0.63; P = 0.0005). The change in staffing patterns accounted for 39% of the variance in violence. An examination of the characteristics of all patients admitted to the ward revealed that the violent patients were significantly younger, more likely to have been admitted compulsorily and less likely to be depressed than non-violent ones.