Table 7. Effect of changes in VDU characteristics on expert assessments at the 2-month follow up.
Coefficients of determination for a difference in a characteristic (partial R2 ) and for the whole model (R2 ) are presented.

2-month – Baseline
Expert 1
 
 
Expert 2
 
estimatea
partial R2
p-valueb
 
model R2
 
 
estimatea
partial R2
p-valueb
 
model R2
Distance between mouse and front edge of table (cm)
0.029
0.039
0.0108
 
0.430
 
 
0.035
0.042
0.0154
 
0.317
Distance between mouse and the point between g-h keys (cm)
-0.035
0.050
0.0043
 
0.435
 
 
-0.046
0.067
0.002
 
0.357
Vertical distance between mouse pad and floor (cm)
0.020
0.002
0.5477
 
0.400
 
 
0.092
0.034
0.0262
 
0.317
Viewing distance to the first text line on the screen (cm)
0.016
0.008
0.2373
 
0.416
 
 
0.036
0.033
0.0253
 
0.342
Viewing distance to the home row of the keyboard (cm)
-0.016
0.002
0.5246
 
0.410
 
 
-0.019
0.003
0.5357
 
0.308
Viewing angle to the first text line of the screen (°)
0.049
0.066
0.0005
 
0.474
 
 
0.036
0.027
0.0466
 
0.332
Viewing angle to the home row of the keyboard (°)
0.066
0.073
0.0002
 
0.482
 
 
0.042
0.029
0.0738
 
0.338
Vertical distance between the eye and floor (cm)
0.029
0.011
0.1649
 
0.421
 
 
0.047
0.022
0.0771
 
0.319
Distance between g-h keys and table front edge (cm)
0.059
0.060
0.0013
 
0.453
 
 
0.084
0.088
0.0002
 
0.408
Left deviation of g-h keys and sagittal plane of the worker (cm)
-0.028
0.008
0.2457
 
0.424
 
 
-0.002
0
0.9615
 
0.325
Vertical distance between front edge of the seat and keyboard table top (cm)
0.042
0.013
0.1249
 
0.457
 
 
0.095
0.049
0.005
 
0.392
Ergonomics of the work chair
0.264
0.016
0.0888
 
0.442
 
 
0.322
0.018
0.0968
 
0.352
Tidiness and space
0.561
0.056
0.0014
 
0.472
 
 
0.541
0.039
0.0151
 
0.353

a estimate (coefficient g in Equation 1) for a difference in a characteristic in the linear regression model.
b significance for a difference in a characteristic to be in the linear regression model (Equation 1).