Table 2

Cerebellar disease rating scale (CDRS)

Clinical Parameter
Gait ataxia (assessed in association with the Rhomberg’s test and  peripheral nerve examination)
 0=Normal
 1=Mild: able to walk without support
 2=Moderate: may need some support or assistance with walking
 3=Severe: needs assistance and/or support to walk
 4=Unable to walk due to ataxia
LR
Dysmetria (left and right) (assessed using the finger nose test)
 0=Normal
 1=Mild: overshoots target occasionally (<20%)
 2=Moderate: overshoots target frequently (20-40%)
 3=Severe: overshoots target very frequently (40-80%)
 4=Very severe: overshoots target most of the time (80-100%)
Intention tremor (left and right) (assessed using the finger nose test)
 0=Normal
 1=Mild: intention tremor only present at extremes of movement
 2=Moderate: intention tremor only present at extremes of movement
 3=Severe: intention tremor present throughout movement
 4=Very severe: unable to perform test because of tremor
Rebound (left and right) (assessed using outstretched arms with eyes  closed)
 0=Normal
 1=Mild: a few oscillations, arms stabilise spontaneously
 2=Moderate: marked oscillations, arms stabilise spontaneously
 3=Severe: marked oscillations, arms unable to stabilise spontaneously
 4=Very severe: unable to keep arms still at rest
Dysdiadochokinesia (left and right) (assessed using rapid alternating  movements)
 0=Normal
 1=Mild slowing and breakdown of movements
 2=Moderately impaired: slow and clumsy movements
 3=Severely impaired: very slow and chaotic movements
 4=Very severe: unable to perform rapid movements
Total score (max=36)