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Uniform Data Set version 4
UDSv4 - Template

United States
Reference ID
USDv4
Producer(s)
National Alzheimer’s Coordinating Center (NACC) and the NIA-funded ADRC network
Collections
Clinical Trial
Metadata
DDI/XML JSON
Created on
Jul 02, 2026
Last modified
Jul 07, 2026
Page views
11411
Variable Groups

Variable Groups

Variable group: B3 Unified Parkinson's Disease Rating Scale (UPDRS) - Motor Exam
Variables 62
arising
10. Arising from chair
arisingx
10a. Arising from chair untestable (specify)
b3not
0d1. If 'B3 UPDRS-Parkinson's' not submitted, specify reason
bradykin
14. Body bradykinesia and hypokinesia
bradykix
14a. Body bradykinesia and hypokinesia untestable (specify)
facexp
2. Facial expression
facexpx
2a. Facial expression untestable (specify)
frmdateb3
0a. B3 UPDRS-Parkinson's - Form date
gait
12. Gait
gaitx
12a. Gait untestable (specify)
handaltl
8b. Rapid alternating movement of hands - left hand
handaltr
8a. Rapid alternating movement of hands - right hand
handatlx
8b1. Rapid alternating movements of hands - left hand untestable (specify)
handatrx
8a1. Rapid alternating movement of hands - right hand untestable (specify)
handmovl
7b. Hand movements - left hand
handmovr
7a. Hand movements - right hand
handmvlx
7b1. Hand movements - left hand untestable (specify)
handmvrx
7a1. Hand movements - right hand untestable (specify)
initialsb3
0b. B3 UPDRS-Parkinson's - Examiner's initials
langb3
0c. B3 UPDRS-Parkinson's - Language
leglf
9b. Leg agility - left leg
leglfx
9b1. Leg agility - left leg untestable (specify)
legrt
9a. Leg agility - right leg
legrtx
9a1. Leg agility - right leg untestable (specify)
loc_pdnormal_lastvis_calc
If pdnormal is selected in a previous visit, then 'UPDRS is normal', else 'not selected'
modeb3
0d. B3 UPDRS-Parkinson's - In-person or not completed?
pdnormal
UPDRS is normal
posstab
13. Posture stability
posstabx
13a. Posture stability untestable (specify)
posture
11. Posture
posturex
11a. Posture untestable (specify)
rigdlolf
5e. Rigidity - left lower extremity
rigdlolx
5e1. Rigidity - left lower extremity untestable (specify)
rigdlort
5d. Rigidity - right lower extremity
rigdlorx
5d1. Rigidity - right lower extremity untestable (specify)
rigdneck
5a. Rigidity - neck
rigdnex
5a1. Rigidity - neck untestable (specify)
rigduplf
5c. Rigidity - left upper extremity
rigduplx
5c1. Rigidity - left upper extremity untestable (specify)
rigduprt
5b. Rigidity - right upper extremity
rigduprx
5b1. Rigidity - right upper extremity untestable (specify)
speech
1. Speech
speechx
1a. Speech untestable (specify)
tapslf
6b. Finger taps - left hand
tapslfx
6b1. Finger taps - left hand untestable (specify)
tapsrt
6a. Finger taps - right hand
tapsrtx
6a1. Finger taps - right hand untestable (specify)
totalupdrs
Total UPDRS Score
tractlhd
4b. Action or postural tremor of hands - left hand
tractlhx
4b1. Action or postural tremor of hands - left hand untestable (specify)
tractrhd
4a. Action or postural tremor of hands - right hand
tractrhx
4a1. Action or postural tremor of hands - right hand untestable (specify)
trestfac
3a. Tremor at rest - face, lips, chin
trestfax
3a1. Tremor at rest - face, lips, chin untestable (specify)
trestlft
3e. Tremor at rest - left foot
trestlfx
3e1. Tremor at rest - left foot untestable (specify)
trestlhd
3c. Tremor at rest - left hand
trestlhx
3c1. Tremor at rest - left hand untestable (specify)
trestrft
3d. Tremor at rest - right foot
trestrfx
3d1. Tremor at rest - right foot untestable (specify)
trestrhd
3b. Tremor at rest - right hand
trestrhx
3b1. Tremor at rest - right hand untestable (specify)
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