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The Pittsburgh Sleep Quality Index (PSQI) is a widely used measurement tool for assessing sleep disturbance and is broadly used in clinical and healthy populations. Yet, validation of the PSQI has rarely been carried out for a relatively large non-clinical sample in the United States. The aim for the current study is to examine the structure validity of the PSQI. Data from 2189 individuals (mean age 35.88) were analyzed by exploratory factor analysis (EFA) followed by confirmatory factor analysis (CFA). Furthermore, measurement invariance across age groups was examined using multigroup CFA. We found that a three-factor model (i.e., sleep efficiency, sleep latency, and sleep quality) fitted better than the commonly used single-factor structure. Specifically, for the three-factor model, the comparative fit index was 0.99, the Tucker–Lewis fit index was 0.99, and the root-mean-square error of approximation was 0.04. Those fit indices further indicated a good fit between the model and the observed data. Measurement invariance results suggested that the factor structure of PSQI is not comparable for different age groups, which has implications for future research studies. Our findings validated the factor structure of the PSQI on non-clinical populations and recommended the use of three separate factors to assess sleep quality. In addition, the findings demonstrated that different models should be used to assess sleep disturbance across age groups. However, further research is required to determine the appropriate cut-off points for different age groups. [ABSTRACT FROM AUTHOR]

Deutz P. and Gibbs D. Industrial ecology and regional development: eco-industrial development as cluster policy, Regional Studies. Aspects of industrial ecology fit closely with work in regional development investigating clustering, networking, and local economic development. However, there has been limited cross-fertilization between these bodies of literature. This paper uses an empirical focus on eco-industrial developments in the USA to postulate that industrial ecology can be viewed as a distinct cluster concept and to consider the implications of this for both industrial ecology and regional development policies. [image omitted] Deutz P. et Gibbs D. L'ecologie industrielle et l'amenagement du territoire: le developpement industriel ecologique comme politique d'agglomeration, Regional Studies. Des aspects de l'ecologie industrielle sont en correlation etroite avec des recherches dans le domaine de l'amenagement du territoire qui examinent l'agglomeration, la connexion et le developpement local economique. Cependant, il y a eu peu de synergie entre ces faisceaux de documentation. Cet article porte de facon empirique sur les developpements industriels ecologiques aux E-U afin de postuler que l'on peut envisager l'ecologie industrielle comme une notion indeniable d'agglomeration et en considerer les retombees a la fois pour l'ecologie industrielle et les politiques d'amenagement du territoire. Ecologie industrielle Parcs industriels ecologiques Symbiose industrielle Agglomerations regionales Connexion Deutz P. und Gibbs D. Industrieokologie und Regionalentwicklung: oko-industrielle Entwicklung als Cluster-Politik, Regional Studies. Die Aspekte der Industrieokologie sind eng mit der Arbeit der Regionalentwicklung verzahnt, was die Untersuchung von Clusterbildungen, Netzwerken und lokaler Wirtschaftsentwicklung anbelangt. Die gegenseitige Befruchtung zwischen diesen Literaturkorpern fiel jedoch bisher eher begrenzt aus. In diesem Beitrag wird anhand eines empirischen Fokus auf den okoindustriellen Entwicklungen in den USA postuliert, dass sich die Industrieokologie als eigenstandiges Cluster-Konzept betrachten lasst, und es werden die Auswirkungen auf die Politiken fur Industrieokologie und Regionalentwicklung untersucht. Industrieokologie Oko-Industrieparks Industriesymbiose Regionalentwicklung Cluster Netzwerke Deutz P. y Gibbs D. Ecologia industrial y desarrollo regional: desarrollo ecoindustrial como politica de aglomeracion, Regional Studies. Los aspectos de la ecologia industrial estan estrechamente vinculados al trabajo en el desarrollo regional que estudia la aglomeracion, las redes y el desarrollo economico local. Sin embargo, la mutua hibridacion entre estos organismos de literatura ha estado limitada. En este articulo usamos un enfoque empirico sobre los desarrollos ecoindustriales en los EE.UU. para postular que la ecologia industrial puede considerarse un concepto distintivo de aglomeraciones y para considerar que efectos tiene esto en la ecologia industrial y las politicas de desarrollo industrial. Ecologia industrial Parques ecoindustriales Simbiosis industrial Desarrollo regional Aglomeraciones Redes [ABSTRACT FROM AUTHOR]