Objectives:
To assess responsiveness and test-retest reliability of OHIP-TMDs
Methods:
Responsiveness- Patients with confirmed Axis 1 RDC TMD diagnoses (n=67) were selected from consecutive patients referred to Newcastle Dental Hospital. Two weeks before their consultation patients were randomised to receive either OHIP-49 or OHIP-TMDs to complete and return. Just before consultation the other version was completed allowing paired comparisons before treatment and in the same way after three months routine management. Responsiveness to management involved comparing effect size (Cohen’s d) of the questionnaire summary scores. ROC analyses allowed an assessment of the area under the curve relative to a Global assessment administered at three months. The items comprising OHIP-14 were analysed similarly.
Test-retest reliability- a further patient group was administered OHIP-TMDs twice: two weeks before consultation and in the waiting room whilst waiting for their appointment. Summed scores were compared by Intraclass correlation coefficient(ICC).
Results:
Effect sizes were 0.45 (95% CI 0.41-0.48) for OHIP-49; 0.43 (0.38-0.48) for OHIP-TMDs and 0.35(0.31-0.39) for OHIP-14. Areas under the ROC curves were 0.79 for OHIP-49; 0.80 for OHIP-TMDs and 0.77 for OHIP-14. Test retest of OHIP-TMDs ICC=0.98.
Conclusions:
OHIP-49 and OHIP-TMDs performed similarly with a greater effect size than the derived OHIP-14. Either OHIP-49 or OHIP-TMDs are appropriate to measure QOL as a treatment outcome but OHIP-TMDs has greater utility being shorter.