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Table 2 Characteristics of six validated screening tools of RBD

From: REM sleep behavior disorder was associated with Parkinson’s disease: a community-based study

Scale REM Sleep Behavior disorder Screening questionnaire (RBDSQ) [12] Validation of RBDSQ
in China [16]
Mayo Sleep Questionnaire (MSQ) [17] REM Sleep Behavior Disorder Questionnaire–Hong Kong (RBDQ-HK) [13] Validation of RBDQ-HK
in east China [15]
RBD Single-Question Screen
(RBD1Q) [7]
Innsbruck REM Sleep Behavior Disroder Inventory (RBD-I) [14] Chinese version of RBD1Q (RBD1Q-C)
No. of items 13 items - 1 screening question on RBD (plus 5 additional questions if screened positive) 13 questions (Or use the Factor 2 behavioral subscale, which contains 7 questions) - 1 question 5 questions 1 question
Informants Patient, bed partner encouraged - Bed partner only Patient and/or bed partner - Patient, spouse/Caregiver encouraged Patient, bed partner encouraged Patient, bed partner encouraged
Validation study         
Study cases n = 54
Idiopathic RBD RBD co-morbid with narcolepsy
n = 63
Idiopathic RBD
RBD associated with PD
n = 81
RBD co-morbid with cognitive impairment/neurodegenerative diseases
n = 107
Idiopathic RBD
RBD co-morbid with narcolepsy/neurodegenerative diseases
n = 115
Idiopathic RBD, RBDassociated with PD, RBD like disorder
n = 242
Idiopathic RBD
n = 70
Idiopathic RBD
RBD co-morbid with narcolepsy/neurodegenerative diseases
n = 14
Idiopathic RBD
RBD co-morbid with neurodegenerative diseases
Study controls Sleep patients (n = 160)
Healthy subjects (n = 133)
Sleep patients (n = 78)
PD patients without RBD (n = 35)
Healthy subjects (n = 50)
Patients mostly with cognitive impairment/Parkinson’s disease (n = 66) Sleep patients (n = 86)
Psychiatric patients (n = 6)
Healthy subjects (n = 15)
Sleep patients(n = 124)
Patients with neurogenerative disorder(n = 74)
Healthy subjects(n = 12)
Sleep patients and healthy control (total n = 242) Sleep patients(total = 140) Sleep patients and healthy control (total n = 32)
Diagnostic methods RBD patients & sleep patients: PSG. Healthy subjects: Medical history only, no PSG PSG PSG PSG PSG PSG PSG PSG
Psychometric properties         
Cut-off 5/13 5/13 - 19/100 for total scale and 8/70 for Factor 2 subscale 17/100 for total scale and 7 or 8/70 for Factor 2 subscale - 0.25 (number of positive symptoms divided by number of answered questions) -
Sensitivity/Specificity 96 %/56 % 92.1 %/81.2 % 98 %/74 % 82.2 %/86.9 %
87.9 %/81.3 %(subscale)
85 %/81 %
90 %/82 %(subscale)
93.8 %/87.2 % 91.4 %/85.7 % 100 %/55.6 %