Share Page:

Volume 22 , Issue 4
Fall 2008

Pages 331–339

Extraction of RDC/TMD Subscales from the Symptom Check List-90: Does Context Alter Respondent Behavior?

Richard Ohrbach, DDS, PhD/Jeffrey Sherman, PhD/Carla Beneduce, RDH/Kimberly Zittel-Palamara, MSW, PhD/Youngju Pak, PhD

PMID: 19090406

Aims: To test whether extraction of the 2 subscales in the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) affected the subscale score reliability and whether scores from the RDC/TMD subscales are comparable to the same scales when the whole Symptom Check List-90 (SCL-90R) is administered. Methods: The full SCL90-R and a modified version containing only the depression and somatization scales were administered in counterbalanced order to 103 subjects. As another test of context, a subset of participants completed the modified and full versions as part of a larger battery of instruments relevant to facial pain. Statistical analyses included internal reliability for item analysis and intraclass correlation (ICC) and Lin’s concordance correlation coefficient (CCC) for total scale score reliability. Results: Internal reliability was approximately 0.95 for depression and 0.87 for somatization, independent of test form. Total scale scores were reliable across test versions, with both ICC and CCC approximately 0.95 for depression and 0.91 for somatization. Permutation tests using the CCC indicated a mild influence on the somatization score but not the depression score due to order effects, but these effects were not significant when considering the 95% CIs based on resampling methods. Conclusion: Whether items from other subscales are present or not does not affect the internal reliability or parallel forms reliability of the total scores from either depression or somatization. Context of administration, via order of forms completion, does not alter total score or reliability of depressive items but may alter total scores for somatization. J Orofac Pain 2008;22:331–339

Key words: psychometrics, RDC/TMD, reliability, validity

Full Text PDF File | Order Article


Get Adobe Reader
Adobe Acrobat Reader is required to view PDF files. This is a free program available from the Adobe web site.
Follow the download directions on the Adobe web site to get your copy of Adobe Acrobat Reader.


© 2017 Quintessence Publishing Co, Inc

Current Issue
Ahead of Print
Author Guidelines
Accepted Manuscripts
Submission Form
Quintessence Home
Terms of Use
Privacy Policy
About Us
Contact Us