title: Validation of the Portuguese version of the Pittsburgh Sleep Quality Index (PSQI-PT).
abstract: The present study was realised to validate the Portuguese version of the PSQI. The instrument PSQI-PT was applied to 347 Portuguese community-dwelling adults aged 18-69 years old. The resulting data was used to perform the psychometric analysis to validate the instrument. No structural modifications to the questionnaire were necessary during the adaptation process. The scores for the PSQI-PT showed an adequate internal consistency. The principal component analysis (PCA) produced good factor loading for all items. Finally, the analysis of demographic variables showed that age and literacy influence the values for the "Global Sleep Quality" (GSQ) in this Portuguese sample. In conclusion, this study demonstrated that the PSQI-PT is a valid and reliable instrument for the assessment of sleep quality with the advantage of allowing community-dwelling adults differentiation between good and poor sleepers.
authors.affiliation: University of Algarve, Portugal. Electronic address: delriokarina@gmail.com.
authors.forename: Karine Alexandra
authors.initials: KA
authors.lastname: Del Rio João
authors.affiliation: University of Algarve, Portugal; Research Center for Spatial and Organizational Dynamics, University of Algarve, Portugal.
authors.forename: Nathália Brandolim
authors.initials: NB
authors.lastname: Becker
authors.affiliation: Research Center for Spatial and Organizational Dynamics, University of Algarve, Portugal. Electronic address: snjesus@ualg.pt.
authors.forename: Saul
authors.initials: S
authors.lastname: de Neves Jesus
authors.affiliation: Master student in Clinic and Health Psychology, University of Algarve, Portugal.
authors.forename: Rute
authors.initials: R
authors.lastname: Isabel Santos Martins
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D011174:Portugal; D025341:Principal Component Analysis; D011594:Psychometrics; D015203:Reproducibility of Results; D012890:Sleep; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis* / Q000523:psychology; D011795:Surveys and Questionnaires / Q000592:standards*; D014177:Translations; D055815:Young Adult
keywords: Community-dwelling adults; Pittsburgh Sleep Quality Index; Portuguese validation; Sleep quality