Author/Editor		Rener-Sitar, Ksenija; John, Mike T.; Bandyopadhyay, Dipankar; Howell, Michael J; Schiffman, Eric L
Title		Exploration of dimensionality and psychometric properties of the Pittsburgh Sleep Quality Index in cases with temporomandibular disorders
Type		članek
Vol. and No.		Letnik 12
Publication year		2014
ISSN		1477-7525 - Health and quality of life outcomes
Language		eng
Abstract		Background This study assessed the dimensional structure of sleep quality with the Pittsburgh Sleep Quality Index (PSQI) and investigated its psychometric properties in cases with temporomandibular disorders (TMD). Methods A convenience sample of 609 TMD cases (age: 37.1 +- 13.1 yrs, 18-67 yrs, 85% female) of the multi-center Validation Project meeting Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) and with sufficient PSQI data were included in this study. To investigate PSQI scores' dimensionality, exploratory factor analysis was used. Factors were identified using the Scree plot. To investigate internal consistency, Cronbach's alpha was calculated. Analyses were separately performed for TMD cases with (N =496) and TMD cases withouta pain-related diagnosis (N =113). Results The mean PSQI score for all TMD cases was 7. +- 4.0 units, range: 0%19. The exploratory factor analysis identified one factor for cases with at least one pain-related TMD diagnosis as well as one factor for cases with a pain-free TMD diagnosis that explained 41% of the variance in cases with pain-related TMD and 37% in cases with pain-free TMD. Internal consistency for PSQI scores was alpha of 0.75 in cases with pain-related TMD, alpha of 0.66 in cases with pain-free TMD and alpha =%0.75 for all TMD cases. Conclusions Sleep quality in TMD patients is a unidimensional construct and can therefore be represented by one summary score; a finding that is in line with previous reports in TMD patients.
Keywords		temporomandibular disorders sleep disorders chronic pain temporomandibularna motnja motnje spanja kronična bolečina