The following pictures show the experimental test conditions in the study:

Desk Control Condition: in this condition subjects typed using a regular keyboard on a flat desktop.
Tray Control Condition: in this condition subjects typed using a regular keyboard on a flat keyboard tray that was height adjustable.
Treatment Condition: in this condition subjects typed using a regular keyboard on the Preset Tiltdown keyboard tray that was height adjustable.

The following pictures show the main effect of the treatment in the study, where it was found that the Preset Tiltdown arrangement resulted in less wrist deviation during typing:

Click on the images to enlarge.

For more information contact:

Professor Alan Hedge: ah29@cornell.edu  
Human Factors, Dept. Design & Environmental Analysis, NYS College of Human Ecology (607) 255-1957