title: Reliability and validity of the Brazilian version of the Pittsburgh Sleep Quality Index in adolescents.
abstract: OBJECTIVE
  To evaluate the reliability and validity of the Brazilian version of the Pittsburgh Sleep Quality Index.
  
  
  METHODS
  309 adolescents, subdivided into a sample of 209 subjects, of whom 25 were reassessed, and another sample of 100 adolescents. Reliability was assessed using Cronbach's α-values, intraclass correlation coefficient, Standard Error of Measure, Minimum Detectable Change, and Bland-Altman plotting. Exploratory analysis of the questionnaire components was performed based on the sample of 209 adolescents. Confirmatory factor analysis was performed with a sample of 100 individuals.
  
  
  RESULTS
  The sample of 209 participants had a mean age of 14.38 (±1.94) years, comprising 80 (38.3%) girls and 129 (61.7%) boys. The sample of 100 adolescents had a mean age of 13.66 (±2.35) years, comprising 51 (51%) girls and 49 (49%) boys. The questionnaire obtained a Standard Error of Measure=1.12 and Minimum Detectable Change=3.10. Cronbach's α was 0.71 and the Intraclass Correlation Coefficient was 0.65 (95% CI: 0.21-0.85). The factor analysis showed that the best model of components was the one that consisted of two factors, excluding the component on the use of sleep medications.
  
  
  CONCLUSIONS
  The questionnaire showed high internal consistency and moderate reliability. Furthermore, a model with two factors seems to be the most appropriate to evaluate the quality of sleep in adolescents.
authors: Universidade de Pernambuco (UPE), Programa de Mestrado em Hebiatria, Recife, PE, Brazil. Electronic address: muana.pereira@hotmail.com.
authors: Muana H P
authors: MH
authors: Passos
authors: Universidade de Pernambuco (UPE), Programa de Mestrado em Hebiatria, Recife, PE, Brazil.
authors: Hítalo A
authors: HA
authors: Silva
authors: Universidade de Pernambuco (UPE), Programa de Mestrado em Hebiatria, Recife, PE, Brazil; Universidade de Pernambuco (UPE), Departamento de Fisioterapia, Petrolina, PE, Brazil.
authors: Ana C R
authors: AC
authors: Pitangui
authors: Universidade de Pernambuco (UPE), Programa de Mestrado em Hebiatria, Recife, PE, Brazil.
authors: Valéria M A
authors: VM
authors: Oliveira
authors: Universidade de Pernambuco (UPE), Programa de Mestrado em Hebiatria, Recife, PE, Brazil.
authors: Alaine S
authors: AS
authors: Lima
authors: Universidade de Pernambuco (UPE), Programa de Mestrado em Hebiatria, Recife, PE, Brazil; Universidade de Pernambuco (UPE), Departamento de Fisioterapia, Petrolina, PE, Brazil; Universidade de Pernambuco (UPE)/Universidade Federal da Paraíba (UFPB), Programa Associado de Pós-graduação em Educação Física, Recife, PE, Brazil.
authors: Rodrigo C
authors: RC
authors: Araújo
mesh_terms: D000293:Adolescent; D000328:Adult; D001938:Brazil; D002648:Child; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D011788:Quality of Life; D015203:Reproducibility of Results; D012890:Sleep; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis*; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: Adolescentes; Adolescents; Análise fatorial; Factor analysis; Reproducibility of results; Reprodutibilidade dos resultados; Sleep disorders; Transtornos do sono