Using de-escalation techniques  for people with psychosis induced aggression or agitation appears to be accepted as good clinical practice but is not supported by evidence from r and omised trials .
BACKGROUND Aggression is a disposition , a willingness to inflict harm , regardless of whether this is behaviourally or verbally expressed and regardless of whether physical harm is sustained .
De-escalation is a psychosocial intervention for managing people with disturbed or aggressive behaviour .
Secondary management strategies such as rapid tranquillisation , physical intervention and seclusion should only be considered once de-escalation and other strategies have failed to calm the service user .
OBJECTIVES To investigate the effects of de-escalation techniques in the short-term management of aggression or agitation  thought or likely to be due to psychosis .
It is unclear why it has remained such an under- research ed area .
Components of variance and intraclass correlations for the design of community-based surveys and intervention studies: data from the Health Survey for England 1994.
The authors estimated components of variance and intraclass correlation coefficients ( ICCs ) to aid in the design of complex surveys and community intervention studies by analyzing data from the Health Survey for Engl and 1994 . This cross-sectional survey of English adults included data on a range of lifestyle risk factors and health outcomes . For the survey , households were sample d in 720 postal code sectors nested within 177 district health authorities and 14 regional health authorities . Study subjects were adults aged 16 years or more .  ICCs and components of variance were estimated from a nested r and om-effects analysis of variance . Results are presented at the district health authority , postal code sector , and household levels . Between-cluster variation was evident at each level of clustering . In these data , ICCs were inversely related to cluster size , but design effects could be substantial when the cluster size was large . Most ICCs were below 0.01 at the district health authority level , and they were mostly below 0.05 at the postal code sector level . At the household level , many ICCs were in the range of 0.0 - 0.3 . These data may provide useful information for the design of epidemiologic studies in which the units sample d or allocated range in size from households to large administrative areas
Using de-escalation techniques  for people with psychosis induced aggression or agitation appears to be accepted as good clinical practice but is not supported by evidence from r and omised trials .
BACKGROUND Aggression is a disposition , a willingness to inflict harm , regardless of whether this is behaviourally or verbally expressed and regardless of whether physical harm is sustained .
De-escalation is a psychosocial intervention for managing people with disturbed or aggressive behaviour .
Secondary management strategies such as rapid tranquillisation , physical intervention and seclusion should only be considered once de-escalation and other strategies have failed to calm the service user .
OBJECTIVES To investigate the effects of de-escalation techniques in the short-term management of aggression or agitation  thought or likely to be due to psychosis .
It is unclear why it has remained such an under- research ed area .