Exploration of dimensionality and psychometric properties of the Pittsburgh Sleep Quality Index in cases with temporomandibular disorders.
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 7.1 ± 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.
Division of Dental Medicine, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia. ksenija.rener@mf.uni-lj.si.
Ksenija
K
Rener-Sitar
Mike T
MT
John
Dipankar
D
Bandyopadhyay
Michael J
MJ
Howell
Eric L
EL
Schiffman
D000293:Adolescent; D000328:Adult; D000368:Aged; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000209:etiology / Q000523:psychology; D011594:Psychometrics; D011788:Quality of Life / Q000523:psychology; D015203:Reproducibility of Results; D012890:Sleep; D012893:Sleep Wake Disorders / Q000209:etiology / Q000523:psychology; D011795:Surveys and Questionnaires; D013705:Temporomandibular Joint Disorders / Q000150:complications* / Q000523:psychology; D055815:Young Adult