Scientific Investigations
Psychometric Characteristics of the Pittsburgh Sleep Quality Index in English Speaking Non-Hispanic Whites and English and Spanish Speaking Hispanics of Mexican Descent
http://dx.doi.org/10.5664/jcsm.2342
Lianne M. Tomfohr, M.S.1; C. Amanda Schweizer, M.S.1; Joel E. Dimsdale, M.D.1,2; José S. Loredo, M.D., F.A.A.S.M.3
1San Diego State University & University of California, San Diego, Joint Doctoral Program in Clinical Psychology, San Diego, CA; 2Department of Psychiatry, University of California, San Diego, CA; 3Department of Medicine, University of California San Diego, School of Medicine, San Diego, CA
Study Objectives:
The current study investigated the factor structure of the Pittsburgh Sleep Quality Index (PSQI) among English speaking non-Hispanic whites (NHW) and English and Spanish speaking Hispanics of Mexican descent (HMD).
Design:
The PSQI was administered during a telephone interview. In order to test the factor structure of the PSQI structure across ethnic/language groups, multiple group confirmatory analysis with covariates (MIMIC) was employed. The 1- and 3-factor versions of the PSQI previously reported in the literature were examined.
Setting:
San Diego County.
Participants:
Community-dwelling English speaking, NHW (n = 1,698) and English (n = 654) and Spanish (n = 792) speaking HMD.
Measurement and Results:
A single-factor scoring model fit across language/ethnic groups; however, a 3-factor model provided a better than the 1-factor model in all language/ethnic groups. The subscale sleep medications loaded poorly and was removed from all models.
Conclusion:
Across groups, a 3-factor model of the PSQI more reliably assessed sleep quality than a single-factor global score. Results indicate that the 3-factor structure of the PSQI was uniform across English speaking NHW and English and Spanish speaking HMD.
Citation:
Tomfohr LM; Schweizer CA; Dimsdale JE; Loredo JS. Psychometric characteristics of the Pittsburgh Sleep Quality Index in English speaking non-Hispanic whites and English and Spanish speaking Hispanics of Mexican descent. J Clin Sleep Med 2013;9(1):61-66.
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