RESUMO
INTRODUCTION: The Pittsburgh Sleep Quality Index (PSQI) has become a standard instrument to measure sleep quality. However, its factor structure has not been fully explored and the available Spanish versions have revealed the need to make adaptations. Our objective was to assess the factor structure and reliability of the PSQI. METHODS: Eighty seven psychiatric patients without treatment and 48 control subjects underwent psychiatric structured assessment and completed the PSQI. Internal consistency and factor structure of PSQI was measured and the scale scores were compared between groups and by gender. Association with age was also calculated. RESULTS: There were no significant differences between psychiatric patients and control subjects on age and gender. Subjects had no problem understanding and answering the questions in the instrument. The PSQI displayed a satisfactory reliability coefficient (0.78) and component-total score correlations were all significant (0.53-0.77). The PSQI showed two main factors: sleep duration and sleep quality. Patients obtained significantly higher scores than controls, in both the global and the component scores, with the exception of sleep duration. The PSQI scores were not significantly different between males and females and were not associated with age. CONCLUSIONS: The PSQI is a reliable instrument to measure sleep quality in Mexican subjects.
Assuntos
Transtornos Mentais/fisiopatologia , Qualidade de Vida , Sono , Inquéritos e Questionários , Adolescente , Adulto , Idoso , Análise Fatorial , Feminino , Humanos , Idioma , Masculino , Pessoa de Meia-Idade , Reprodutibilidade dos Testes , Adulto JovemRESUMO
Introducción: El Índice de Calidad de Sueño de Pittsburgh (ICSP) se ha convertido en un instrumento estándar para la medición de la calidad del sueño. No obstante, no se ha evaluado su estructura factorial y, además, la existencia de dos versiones en castellano ha puesto de manifiesto la necesidad de realizar adaptaciones. El objetivo de este estudio fue evaluar la confiabilidad y composición factorial del ICSP. Material y métodos: Ochenta y siete pacientes psiquiátricos y 48 sujetos control se sometieron a una entrevista psiquiátrica y completaron el ICSP. Se estimó la consistencia interna y composición factorial del ICSP, se compararon las calificaciones por grupo y sexo, y se estimó la relación con la edad. Los grupos no difirieron significativamente en edad y sexo. Resultados: El ICSP obtuvo un coeficiente de confiabilidad satisfactorio (0.78) y coeficientes de correlación significativos (0.53 a 0.77) entre los componentes y la suma total, quedando conformado por dos factores: calidad de sueño per se y duración del sueño. Los pacientes presentaron calificaciones más altas que los sujetos control, tanto en la suma total como en los componentes, excepto en la duración del sueño. No se identificaron diferencias por sexo, ni relación significativa con la edad. Conclusiones: Estos resultados indican que el ICSP es un instrumento confiable para la evaluación de la calidad del sueño en población mexicana.
INTRODUCTION: The Pittsburgh Sleep Quality Index (PSQI) has become a standard instrument to measure sleep quality. However, its factor structure has not been fully explored and the available Spanish versions have revealed the need to make adaptations. Our objective was to assess the factor structure and reliability of the PSQI. METHODS: Eighty seven psychiatric patients without treatment and 48 control subjects underwent psychiatric structured assessment and completed the PSQI. Internal consistency and factor structure of PSQI was measured and the scale scores were compared between groups and by gender. Association with age was also calculated. RESULTS: There were no significant differences between psychiatric patients and control subjects on age and gender. Subjects had no problem understanding and answering the questions in the instrument. The PSQI displayed a satisfactory reliability coefficient (0.78) and component-total score correlations were all significant (0.53-0.77). The PSQI showed two main factors: sleep duration and sleep quality. Patients obtained significantly higher scores than controls, in both the global and the component scores, with the exception of sleep duration. The PSQI scores were not significantly different between males and females and were not associated with age. CONCLUSIONS: The PSQI is a reliable instrument to measure sleep quality in Mexican subjects.