The traction force is measured with the following formula:
Ftraction = W x sin a

In this formula W stands for the weight of the patient and a stands for the angle of the table with the horizontal plane.

As the table is during the study maximum 15° inverted, we can easily determine the maximal traction force:
Ftraction = W x sin 15°
Ftraction = W x 0,26

Thus, using a 15° inclination:
Maximal traction force = 26 % of the bodyweight