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Original Article
Dementia and Neurocognitive Disorders 2024: 23: 1: 11-21

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Development and Validation of a Screening Questionnaire for Dementia With Lewy Bodies (DLB): the DLB Screening Questionnaire (DLBSQ)
Mincheol Park , 1,2 Kyoungwon Baik , 3 Young H. Sohn , 1 Byoung Seok Ye 1
1 Department of Neurology, Yonsei University College of Medicine, Seoul, Korea 2 Department of Neurology, Chung-Ang University College of Medicine and Graduate School of Medicine, Gwangmyeong Hospital, Gwangmyeong, Korea 3 Department of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea
Development and Validation of a Screening Questionnaire for Dementia With Lewy Bodies (DLB): the DLB Screening Questionnaire (DLBSQ)
Mincheol Park , 1,2 Kyoungwon Baik , 3 Young H. Sohn , 1 Byoung Seok Ye 1
1 Department of Neurology, Yonsei University College of Medicine, Seoul, Korea 2 Department of Neurology, Chung-Ang University College of Medicine and Graduate School of Medicine, Gwangmyeong Hospital, Gwangmyeong, Korea 3 Department of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea
Background and Purpose: Although dementia with Lewy bodies (DLB) is the second most
common cause of neurodegenerative dementia, its clinical prevalence is low. We developed
a short and easy-to-complete DLB screening questionnaire (DLBSQ) to raise diagnostic
sensitivity in routine clinical settings.
Methods: A total of 501 participants were retrospectively enrolled, including 71 controls, 184
patients without DLB, and 246 patients with probable DLB. All patients underwent clinical
evaluation, including core features of DLB, the DLBSQ, brain magnetic resonance imaging,
and detailed neuropsychological assessments. The diagnostic performance of the DLBSQ for
probable DLB was investigated using a receiver operating characteristic curve analysis.
Results: Total DLBSQ score was associated with visuospatial and frontal/executive dysfunction
and the diagnosis of probable DLB. The area under the receiver operating characteristic curve
for total DLBSQ score was 0.727. Youden’s method revealed an optimal cutoff value of 3. The
sensitivity and specificity of the DLBSQ were 68.7% and 62.4%, respectively. Its discriminating
performance improved when cognitive test profiles were additionally considered (area under
the curve: 0.822, sensitivity: 80.6%, and specificity: 70.4%).
Conclusions: The DLBSQ might be a useful screening tool for DLB in routine clinical practice
with good sensitivity and specificity.
Key Words: Lewy Body Disease; Diagnosis; Questionnaire