PMID- 25863811
OWN - NLM
STAT- MEDLINE
DCOM- 20160425
LR  - 20150508
IS  - 1878-5506 (Electronic)
IS  - 1389-9457 (Linking)
VI  - 16
IP  - 5
DP  - 2015 May
TI  - Validating the cross-cultural factor structure and invariance property of the 
      Insomnia Severity Index: evidence based on ordinal EFA and CFA.
PG  - 598-603
LID - S1389-9457(15)00080-5 [pii]
LID - 10.1016/j.sleep.2014.11.016 [doi]
AB  - OBJECTIVE: The purpose of this study is to examine the factor structure of the 
      Insomnia Severity Index (ISI) across samples recruited from different countries. 
      We tried to identify the most appropriate factor model for the ISI and further 
      examined the measurement invariance property of the ISI across samples from 
      different countries. METHODS: Our analyses included one data set collected from a 
      Taiwanese sample and two data sets obtained from samples in Hong Kong and Canada. 
      The data set collected in Taiwan was analyzed with ordinal exploratory factor 
      analysis (EFA) to obtain the appropriate factor model for the ISI. After that, we 
      conducted a series of confirmatory factor analyses (CFAs), which is a special 
      case of the structural equation model (SEM) that concerns the parameters in the 
      measurement model, to the statistics collected in Canada and Hong Kong. The 
      purposes of these CFA were to cross-validate the result obtained from EFA and 
      further examine the cross-cultural measurement invariance of the ISI. RESULTS: 
      The three-factor model outperforms other models in terms of global fit indices in 
      Taiwan's population. Its external validity is also supported by confirmatory 
      factor analyses. Furthermore, the measurement invariance analyses show that the 
      strong invariance property between the samples from different cultures holds, 
      providing evidence that the ISI results obtained in different cultures are 
      comparable. CONCLUSIONS: The factorial validity of the ISI is stable in different 
      populations. More importantly, its invariance property across cultures suggests 
      that the ISI is a valid measure of the insomnia severity construct across 
      countries.
CI  - Copyright (c) 2014 Elsevier B.V. All rights reserved.
FAU - Chen, Po-Yi
AU  - Chen PY
AD  - Department of Psychology, University of Kansas, 1415 Jayhawk Blvd, Fraser Hall, 
      Room 426, Lawrence, KS 66045-7556, USA; Center of Research Method and Data 
      Analysis, University of Kansas, 1415 Jayhawk Blvd, Waston Library 470, Lawrence, 
      KS, USA.
FAU - Yang, Chien-Ming
AU  - Yang CM
AD  - Department of Psychology/The Research Center for Mind, Brain, & Learning, 
      National Chengchi University, No. 64, Sec 2, ZhiNan Rd., Wenshan District, 
      Taipei, Taiwan. Electronic address: yangcm@nccu.edu.tw.
FAU - Morin, Charles M
AU  - Morin CM
AD  - Ecole de Psychologie, Universite Laval, Quebec, QC, Canada; Centre de Recherche 
      de l'Institut Universitaire en Sante Mentale de Quebec, Quebec, QC, Canada.
LA  - eng
PT  - Journal Article
DEP - 20150212
PL  - Netherlands
TA  - Sleep Med
JT  - Sleep medicine
JID - 100898759
SB  - IM
MH  - Canada/epidemiology
MH  - *Cross-Cultural Comparison
MH  - Factor Analysis, Statistical
MH  - Hong Kong/epidemiology
MH  - Humans
MH  - Psychometrics
MH  - Reproducibility of Results
MH  - Severity of Illness Index
MH  - Sleep Initiation and Maintenance Disorders/diagnosis/epidemiology/*ethnology
MH  - Surveys and Questionnaires
MH  - Taiwan/epidemiology
OTO - NOTNLM
OT  - Factorial structure
OT  - Insomnia Severity Index
OT  - Measurement invariance
OT  - Multigroup structural equation model
OT  - Ordinal exploratory factor analysis
EDAT- 2015/04/13 06:00
MHDA- 2016/04/26 06:00
CRDT- 2015/04/13 06:00
PHST- 2014/07/25 00:00 [received]
PHST- 2014/11/08 00:00 [revised]
PHST- 2014/11/13 00:00 [accepted]
PHST- 2015/04/13 06:00 [entrez]
PHST- 2015/04/13 06:00 [pubmed]
PHST- 2016/04/26 06:00 [medline]
AID - S1389-9457(15)00080-5 [pii]
AID - 10.1016/j.sleep.2014.11.016 [doi]
PST - ppublish
SO  - Sleep Med. 2015 May;16(5):598-603. doi: 10.1016/j.sleep.2014.11.016. Epub 2015 
      Feb 12.