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The sensitivity and specificity of the 9-item Wearing-off Questionnaire
M A Stacy1, J M Murphy, D R Greeley
1Division of Neurology, Duke University, 932 Morreene Road, MS 3333, Durham, NC 27705, USA. stacy002@mc.duke.edu
Objective:
This multicenter, cross-sectional study was conducted to determine the sensitivity and specificity of a 9-item Wearing-off Questionnaire (WOQ-9) compared with assessment by a clinician.
Methods:
Patients with a diagnosis of Parkinson's disease (PD) for 5
Results:
One hundred fifty-seven patients reported WO using the WOQ-9; only 79 had been previously diagnosed with WO by a physician. The most frequent items used by physicians to diagnose WO included type of symptoms (69.6%), symptom response (63.3%), and timing of symptom response (58.2%) to medication. Physician assessment of WO and WOQ-9 results corresponded in 76 of 79 cases; physicians disagreed with WO identification in 81 of 157 cases. Sensitivity of the WOQ-9 was 96.2% and specificity was 40.9%.
Conclusion:
The WOQ-9 is a useful screening tool to aid diagnosis of WO in PD patients.
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