title: Barometric pressure, emergency psychiatric visits, and violent acts.
abstract: BACKGROUND
  Associations between human behaviour and psychiatric decompensation and weather variables have been inconsistent.
  
  
  OBJECTIVE
  We studied the association of certain weather variables (specifically, humidity, wind speed, and barometric pressure) with emergent psychiatric presentations, psychiatric admissions, incidence of violent crimes, and suicides in a metropolitan area.
  
  
  METHODS
  We performed a retrospective study for the year 1999 in a mid-sized city. We included all documented emergent psychiatric visits to the city's psychiatric emergency room. We obtained violence data from the city police department and suicide data from the country medical examiner.
  
  
  RESULTS
  The data suggest that total numbers of acts of violence and emergency psychiatry visits are significantly associated with low barometric pressure. Psychiatric inpatient admissions and suicides are not associated with any of the weather variables investigated.
  
  
  CONCLUSIONS
  While alternate conclusions can be drawn, we propose that the data support the interpretation that low barometric pressure is associated with an increase in impulsive behaviours. Additional investigation is warranted.
authors: Mood Disorders Research Program, Department of Psychiatry and Behavioural Sciences, University of Louisville School of Medicine, Louisville, Kentucky 40292, USA.
authors: Thomas J
authors: TJ
authors: Schory
authors: Natasha
authors: N
authors: Piecznski
authors: Sunil
authors: S
authors: Nair
authors: Rif S
authors: RS
authors: el-Mallakh
mesh_terms: D001274:Atmospheric Pressure; D002391:Catchment Area, Health; D004637:Emergency Services, Psychiatric / Q000706:statistics & numerical data*; D006801:Humans; D007629:Kentucky / Q000453:epidemiology; D010343:Patient Admission / Q000706:statistics & numerical data; D011618:Psychotic Disorders / Q000453:epidemiology / Q000523:psychology* / Q000534:rehabilitation*; D012189:Retrospective Studies; D014754:Violence