title: Psychometric properties of the Brazilian version of the Pittsburgh Sleep Quality Index Addendum for PTSD (PSQI-A).
abstract: OBJECTIVE
  Sleep disturbances play a fundamental role in the pathophysiology posttraumatic stress disorder (PTSD), and are not only a secondary feature. The aim of this study was to validate and assess the psychometric properties of the Brazilian version of the Pittsburgh Sleep Quality Index Addendum for PTSD (PSQI-A-BR), a self-report instrument designed to assess the frequency of seven disruptive nocturnal behaviors, in a sample of participants with and without PTSD.
  
  
  METHODS
  PSQI-A was translated into Brazilian Portuguese and applied to a convenience sample of 190 volunteers, with and without PTSD, who had sought treatment for the consequences of a traumatic event.
  
  
  RESULTS
  The PSQI-A-BR displayed satisfactory internal consistency (Cronbach's coefficient of 0.83 between all items) and convergent validity with the Clinician Administered PTSD Scale (CAPS), even when excluding sleep-related items (r = 0.52). Test-retest yielded high agreement in the global PSQI-A-BR, with good stability over time (r = 0.88). A global PSQI-A-BR cutoff score of 7 yielded a sensitivity of 79%, specificity of 64%, and a global score of 7 yielded a positive predictive value of 93% for discriminating participants with PTSD from those without PTSD.
  
  
  CONCLUSIONS
  The PSQI-A-BR is a valid instrument for PTSD assessment, applicable to both clinical and research settings.
authors.affiliation: Department of Psychiatry, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Jair B
authors.initials: JB
authors.lastname: Barbosa Neto
authors.affiliation: Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, USA.
authors.forename: Anne
authors.initials: A
authors.lastname: Germain
authors.affiliation: Department of Psychiatry, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Patrícia F
authors.initials: PF
authors.lastname: Mattos
authors.affiliation: Department of Psychiatry, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Paula M
authors.initials: PM
authors.lastname: Serafim
authors.affiliation: Department of Psychiatry, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Roberta C M
authors.initials: RC
authors.lastname: Santos
authors.affiliation: Department of Psychiatry, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Larissa C
authors.initials: LC
authors.lastname: Martini
authors.affiliation: Department of Psychobiology, UNIFESP, São Paulo, SP, Brazil.
authors.forename: Deborah
authors.initials: D
authors.lastname: Suchecki
authors.affiliation: Department of Psychiatry, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Marcelo F
authors.initials: MF
authors.lastname: Mello
mesh_terms: D000328:Adult; D001938:Brazil; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D012893:Sleep Wake Disorders / Q000175:diagnosis / Q000503:physiopathology*; D018709:Statistics, Nonparametric; D013313:Stress Disorders, Post-Traumatic / Q000175:diagnosis / Q000503:physiopathology*; D011795:Surveys and Questionnaires / Q000592:standards*; D013997:Time Factors; D014177:Translations