Validation of a new REM sleep behavior disorder questionnaire (RBDQ-HK)

S. X. Li, Y. K. Wing, S. P. Lam, J. Zhang, M. W M Yu, C. K W Ho, J. Tsoh, V. Mok

Research output: Contribution to journalArticle

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Abstract

Objectives: There are limited screening instruments for diagnosis of REM sleep behavior disorder (RBD) and none for quantifying the severity of disease. We aimed to validate a 13-item self-reported RBD questionnaire (RBDQ-HK) for diagnostic and monitoring purposes. Methods: Based on ICSD-II and our previous clinical and empirical work, the RBDQ-HK questionnaire was designed and administered in patients attending university-affiliated sleep clinic and psychiatric out-patient clinic, and subjects from the general population. ROC curve and exploratory factor analysis were employed to evaluate the scale, which had a score ranging from 0 to 100. Results: One hundred and seven RBD patients [mean age 62.6 (15.5) years; male 70.1%] and 107 control subjects [mean age 55.3 (9.0) years, male 57.9%] completed the questionnaire. The diagnoses of all the study subjects were independently ascertained by clinical interview and PSG. RBD patients had a significantly higher total RBDQ-HK score [mean (s.d.): 32.1 (16.1), range 3-71] than the control group [9.5 (10.2), range 0-55] (p < 0.005). The RBDQ-HK demonstrated robust psychometric properties with moderate sensitivity (82.2%), specificity (86.9%), positive predictive value (PPV; 86.3%), and negative predictive value (NPV; 83.0%), high internal consistency and test-retest reliability. Exploratory factor analysis revealed two components (dream-related and behavioral factors) that corresponded to the essential clinical features of RBD. The best cut-off for total score (range 0-100) was at 18/19 and the best cut-off for factor 2 (behavioral factors including sleep talking, shouting, limb movements and sleep-related injuries, range 0-70) was at 7/8. Conclusions: The RBDQ-HK has satisfactory validity and reliability as a measure of clinical RBD symptoms and severity. It may serve as an effective tool for diagnosis and evaluation of the disease course to facilitate future clinical and research studies.

Original languageEnglish (US)
Pages (from-to)43-48
Number of pages6
JournalSleep Medicine
Volume11
Issue number1
DOIs
StatePublished - Jan 2010
Externally publishedYes

Fingerprint

REM Sleep Behavior Disorder
Reproducibility of Results
Statistical Factor Analysis
Sleep-Wake Transition Disorders
Sleep
Psychometrics
ROC Curve
Psychiatry
Surveys and Questionnaires
Outpatients
Extremities
Interviews
Sensitivity and Specificity
Control Groups
Wounds and Injuries
Research
Population

Keywords

  • Diagnosis
  • Questionnaire
  • Reliability
  • REM sleep behavior disorder (RBD)
  • Symptom severity
  • Validity

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Li, S. X., Wing, Y. K., Lam, S. P., Zhang, J., Yu, M. W. M., Ho, C. K. W., ... Mok, V. (2010). Validation of a new REM sleep behavior disorder questionnaire (RBDQ-HK). Sleep Medicine, 11(1), 43-48. https://doi.org/10.1016/j.sleep.2009.06.008

Validation of a new REM sleep behavior disorder questionnaire (RBDQ-HK). / Li, S. X.; Wing, Y. K.; Lam, S. P.; Zhang, J.; Yu, M. W M; Ho, C. K W; Tsoh, J.; Mok, V.

In: Sleep Medicine, Vol. 11, No. 1, 01.2010, p. 43-48.

Research output: Contribution to journalArticle

Li, SX, Wing, YK, Lam, SP, Zhang, J, Yu, MWM, Ho, CKW, Tsoh, J & Mok, V 2010, 'Validation of a new REM sleep behavior disorder questionnaire (RBDQ-HK)', Sleep Medicine, vol. 11, no. 1, pp. 43-48. https://doi.org/10.1016/j.sleep.2009.06.008
Li, S. X. ; Wing, Y. K. ; Lam, S. P. ; Zhang, J. ; Yu, M. W M ; Ho, C. K W ; Tsoh, J. ; Mok, V. / Validation of a new REM sleep behavior disorder questionnaire (RBDQ-HK). In: Sleep Medicine. 2010 ; Vol. 11, No. 1. pp. 43-48.
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AU - Zhang, J.

AU - Yu, M. W M

AU - Ho, C. K W

AU - Tsoh, J.

AU - Mok, V.

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N2 - Objectives: There are limited screening instruments for diagnosis of REM sleep behavior disorder (RBD) and none for quantifying the severity of disease. We aimed to validate a 13-item self-reported RBD questionnaire (RBDQ-HK) for diagnostic and monitoring purposes. Methods: Based on ICSD-II and our previous clinical and empirical work, the RBDQ-HK questionnaire was designed and administered in patients attending university-affiliated sleep clinic and psychiatric out-patient clinic, and subjects from the general population. ROC curve and exploratory factor analysis were employed to evaluate the scale, which had a score ranging from 0 to 100. Results: One hundred and seven RBD patients [mean age 62.6 (15.5) years; male 70.1%] and 107 control subjects [mean age 55.3 (9.0) years, male 57.9%] completed the questionnaire. The diagnoses of all the study subjects were independently ascertained by clinical interview and PSG. RBD patients had a significantly higher total RBDQ-HK score [mean (s.d.): 32.1 (16.1), range 3-71] than the control group [9.5 (10.2), range 0-55] (p < 0.005). The RBDQ-HK demonstrated robust psychometric properties with moderate sensitivity (82.2%), specificity (86.9%), positive predictive value (PPV; 86.3%), and negative predictive value (NPV; 83.0%), high internal consistency and test-retest reliability. Exploratory factor analysis revealed two components (dream-related and behavioral factors) that corresponded to the essential clinical features of RBD. The best cut-off for total score (range 0-100) was at 18/19 and the best cut-off for factor 2 (behavioral factors including sleep talking, shouting, limb movements and sleep-related injuries, range 0-70) was at 7/8. Conclusions: The RBDQ-HK has satisfactory validity and reliability as a measure of clinical RBD symptoms and severity. It may serve as an effective tool for diagnosis and evaluation of the disease course to facilitate future clinical and research studies.

AB - Objectives: There are limited screening instruments for diagnosis of REM sleep behavior disorder (RBD) and none for quantifying the severity of disease. We aimed to validate a 13-item self-reported RBD questionnaire (RBDQ-HK) for diagnostic and monitoring purposes. Methods: Based on ICSD-II and our previous clinical and empirical work, the RBDQ-HK questionnaire was designed and administered in patients attending university-affiliated sleep clinic and psychiatric out-patient clinic, and subjects from the general population. ROC curve and exploratory factor analysis were employed to evaluate the scale, which had a score ranging from 0 to 100. Results: One hundred and seven RBD patients [mean age 62.6 (15.5) years; male 70.1%] and 107 control subjects [mean age 55.3 (9.0) years, male 57.9%] completed the questionnaire. The diagnoses of all the study subjects were independently ascertained by clinical interview and PSG. RBD patients had a significantly higher total RBDQ-HK score [mean (s.d.): 32.1 (16.1), range 3-71] than the control group [9.5 (10.2), range 0-55] (p < 0.005). The RBDQ-HK demonstrated robust psychometric properties with moderate sensitivity (82.2%), specificity (86.9%), positive predictive value (PPV; 86.3%), and negative predictive value (NPV; 83.0%), high internal consistency and test-retest reliability. Exploratory factor analysis revealed two components (dream-related and behavioral factors) that corresponded to the essential clinical features of RBD. The best cut-off for total score (range 0-100) was at 18/19 and the best cut-off for factor 2 (behavioral factors including sleep talking, shouting, limb movements and sleep-related injuries, range 0-70) was at 7/8. Conclusions: The RBDQ-HK has satisfactory validity and reliability as a measure of clinical RBD symptoms and severity. It may serve as an effective tool for diagnosis and evaluation of the disease course to facilitate future clinical and research studies.

KW - Diagnosis

KW - Questionnaire

KW - Reliability

KW - REM sleep behavior disorder (RBD)

KW - Symptom severity

KW - Validity

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