title: Validation of the Impulsive/Premeditated Aggression Scale in Mexican psychiatric patients.
abstract: BACKGROUND
  Aggression has been linked to several psychiatric disorders. None of the available instruments validated in Mexico is able to classify aggression as impulsive or premeditated. The Impulsive/Premeditated Aggression Scale (IPAS) is a self-report instrument designed to characterize aggressiveness as predominately impulsive or premeditated.
  
  
  OBJECTIVE
  The aim of the study was to determine the validity and reliability of the IPAS in a sample of Mexican psychiatric patients.
  
  
  METHODS
  A total of 163 patients diagnosed with affective, anxiety or psychotic disorder were included. A principal-component factor analysis was performed to obtain construct validity of the IPAS impulsive and premeditated aggression subscales; convergent validity as well as internal consistency of subscales were also determined.
  
  
  RESULTS
  The rotated matrix accounted for 33.4% of the variance. Significant values were obtained for convergent validity and reliability of the IPAS subscales.
  
  
  CONCLUSIONS
  The IPAS is an adequate instrument, which might be used to differentiate the type of aggressive behavior in Mexican psychiatric patients.
authors.affiliation: Laura Romans, Servicios de Atención Psiquiátrica. Secretaría de Salud . Mexico City , Mexico.
authors.forename: Laura
authors.initials: L
authors.lastname: Romans
authors.forename: Ana
authors.initials: A
authors.lastname: Fresán
authors.forename: Héctor
authors.initials: H
authors.lastname: Sentíes
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Sarmiento
authors.forename: Carlos
authors.initials: C
authors.lastname: Berlanga
authors.forename: Rebeca
authors.initials: R
authors.lastname: Robles-García
authors.forename: Carlos-Alfonso
authors.initials: CA
authors.lastname: Tovilla-Zarate
mesh_terms: D000328:Adult; D000374:Aggression / Q000523:psychology*; D001008:Anxiety Disorders / Q000150:complications / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007175:Impulsive Behavior / Q000502:physiology*; D008297:Male; D008800:Mexico; D019964:Mood Disorders / Q000150:complications / Q000175:diagnosis*; D011569:Psychiatric Status Rating Scales / Q000592:standards*; D011594:Psychometrics / Q000295:instrumentation*; D011618:Psychotic Disorders / Q000150:complications / Q000175:diagnosis*; D015203:Reproducibility of Results; D057566:Self Report; D055815:Young Adult
keywords: Impulsive aggression; Premeditated aggression; Validity