Seasonal variation of seclusion incidents from violent and suicidal acts in forensic psychiatric patients

Abstract

Background: A seasonal variation in violence and suicidal behaviour has been reported in several studies with partially congruent results. Most of forensic psychiatric patients have a history of severe violent behaviour that often continues in spite of regular treatment. In the forensic psychiatric hospital environment aggressive and suicidal acts are often sudden and unpredictable. For reasons of safety, rapid and intensive coercive measures, such as seclusion and restraint, are necessary in the treatment of such patients.

Objective: To examine whether these involuntary seclusions have a seasonal pattern, possibly similar than the reported seasonal variation in violence and suicidal behaviour. By investigating the possibility of a seasonal variation of seclusion incidents from violent and suicidal acts, it may become possible to improve the management of forensic psychiatric patients.

Methods: The hospital files of all secluded patients at Niuvanniemi Hospital from 1 January 1996 to 31 December 2002 were examined. In total, 385 patients (324 male and 61 female) were identified as being secluded at least once in 1930 different incidents (1476 from male and 454 from female patients). Seasonal decomposition and linear regression with dummy month variables were used to examine the possibility of annual variations for seclusions.

Results: The seasonal variation of involuntary seclusion incidents was statistically significant. According to the linear regression model, most of the seclusion incidents, affecting many different patients, began in July and August, and were concentrated throughout the fall until November. The sum of all seclusion days was lowest in January and highest between July and November (difference +31% to +37%).

Conclusions: These findings are mainly in agreement with results from other studies on seasonal variation and violent behaviour. The allocation of staff for late summer and fall might enhance the management of forensic psychiatric patients, thus leading to possible decreases in seclusion incidents. The factors affecting violent, aggressive and suicidal behaviours are complex and more investigation is needed to understand, identify, intervene and effectively reduce such behaviours.