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Table 2 Overview of clinical data of examined WC patients

From: Pathophysiology of writer’s cramp: an exploratory study on task-specificity and non-motor symptoms using an extended fine-motor testing battery

Biographical Variables

Age

[years]

Sex

Main Musical Instrument, Instrumental Group

strings, woodwind, none etc.

Musical Level

professional, amateur, non-musician

Level of Education

secondary modern school, grammar school final exams (comparable to UK A levels), vocational school, university degree

Previous Health Conditions

Affected Hand in patients and respective hand in controls

Handedness

Lifetime Cumulative Fine Motor Activity: Handwriting, Keyboard Typing, Instrumental Music, Other, Summed; all: [yrs]

[years]

Psychological Questionnaires

State Train Anxiety Inventory: State Anxiety, Trait Anxiety

Arm Dystonia Disability Score

NEO-FFI

Motor Performance Tests

 Sub-Test

Measure

Right / Left / Bi-manual

 Aiming

1) error number

2) error duration [ms]

3) total duration [s]

R, L, BR, BL

 Steadiness

1) error number

2) duration [s]

R, L, BR, BL

 Line Tracking

1) error number

2) error duration [ms]

R, L

 Inserting of Long Pins

total duration [s]

R, L, BR, BL

 Inserting of Short Pins

total duration [s]

R, L, BR, BL

 Tapping

1) number of taps during first half of a 32 s recording

2) number of taps during second half

3) total number of taps

R, L, BR, BL

Writing Task

 Overall Writing Time

[s]

 Frequency of the Written Trace

[s−1]

 Mean Frequency of Up- and Downstrokes

[s−1]

 Mean Axial Pressure on Pen

[N]

 Writing Speed

[mm/s]

 Length of Pen on Paper

[mm]

Doodling Circles

 Minimum Axial Pressure on Pen

[N]

 Difference of Minimum Axial Pressure while Doodling and Mean Axial Pressure during Writing Task

[N]

Grip Force Tasks

 Maximum Grip Force (dystonic hand)

[N]

 Maximum kinematic acceleration (dystonic hand)

[N]

 Differential Load Force (dystonic hand)

[N]

 Differential Grip Force (dystonic hand)

[N]

 Mean Grip Force (dystonic hand)

[N]

 Difference of mean Grip Force and Slip Force (dystonic hand)

[N]

 Max Grip Force (non-dystonic hand)

[N]

 Maximum kinematic acceleration (non-dystonic hand)

[N]

 Differential Load Force (non-dystonic hand)

[N]

 Differential Grip Force (non-dystonic hand)

[N]

 Mean Grip Force (non-dystonic hand)

[N]

 Difference of mean Grip Force and Slip Force (non-dystonic hand)

[N]

 Grip force cyclic up-down Task (dystonic hand): min, max, mean and median

[N]

 Grip force cyclic up-down Task (non-dystonic hand): min, max, mean and median

[N]