title: Consistency and reliability of the Brazilian Portuguese version of the Mini-Sleep Questionnaire in undergraduate students.
abstract: OBJECTIVE
  Questionnaires are indispensable tools in epidemiologic studies and clinical surveys. Many questionnaires focusing on sleep disorders have been described in the literature. This cross-sectional study is aimed to assess the consistency and reliability of the Brazilian Portuguese Version of the Mini-Sleep Questionnaire (MSQ-BR).
  
  
  METHODS
  Self-administered questionnaires were given to a sample of 1,108 undergraduate students. The variables collected were age, gender, socioeconomic level, and MSQ-BR scores. A subgroup of 53 students was randomly chosen to test the test-retest reliability of the instrument. Internal consistency of total MSQ-BR and its subscales (i.e., insomnia and hypersomnia) was evaluated using Cronbach's alpha coefficient.
  
  
  RESULTS
  Our results showed good internal consistency of total MSQ-BR score, with a Cronbach's alpha value of 0.770. The insomnia subscale had an adequate internal consistency (Cronbach's alpha, 0.749). On the other hand, the hypersomnia subscale had moderate internal consistency (Cronbach's alpha, 0.624). The test-retest analysis showed good reliability of the instrument using Pearson's correlation coefficient.
  
  
  CONCLUSIONS
  The MSQ-BR has adequate internal consistency and test-retest reliability. The MSQ-BR insomnia has adequate internal consistency for use as a separate application. However, the MSQ-BR hypersomnia demonstrated only moderate internal consistency for use as a separate application. Our intention was not to introduce modifications to the questionnaire, but to evaluate the reliability of total MSQ-BR and its subscales. Others studies are needed to assess the consistency of MSQ compared to other instruments.
authors.affiliation: University of Caxias do Sul, Rua General Arcy da Rocha Nóbrega, Caxias do Sul, RS, Brazil. asdrubalmd@gmail.com
authors.forename: Asdrubal
authors.initials: A
authors.lastname: Falavigna
authors.forename: Márcio Luciano
authors.initials: ML
authors.lastname: de Souza Bezerra
authors.forename: Alisson Roberto
authors.initials: AR
authors.lastname: Teles
authors.forename: Fabrício Diniz
authors.initials: FD
authors.lastname: Kleber
authors.forename: Maíra Cristina
authors.initials: MC
authors.lastname: Velho
authors.forename: Roberta Castilhos
authors.initials: RC
authors.lastname: da Silva
authors.forename: Thaís
authors.initials: T
authors.lastname: Mazzochin
authors.forename: Juliana Tosetto
authors.initials: JT
authors.lastname: Santin
authors.forename: Gabriela
authors.initials: G
authors.lastname: Mosena
authors.forename: Gustavo Lisboa
authors.initials: GL
authors.lastname: de Braga
authors.forename: Francine Lopes
authors.initials: FL
authors.lastname: Petry
authors.forename: Miguel Francisco
authors.initials: MF
authors.lastname: de Lessa Medina
mesh_terms: D000328:Adult; D001938:Brazil; D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000706:statistics & numerical data; D012016:Reference Values; D015203:Reproducibility of Results; D012891:Sleep Apnea Syndromes / Q000175:diagnosis* / Q000453:epidemiology; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis* / Q000453:epidemiology; D013334:Students; D011795:Surveys and Questionnaires; D014175:Translating; D055815:Young Adult