Seat to Desk Clearance (SDC) mismatched 11% and 10% of the students from school A and B, but there was a higher mismatch in the students from school C (36%) (Fig. 5), due to the lower SDC and to the fact that this school presents the higher mean of Thigh Thickness (TT). This situation of mismatch produces mobility constraint because of the contact of the thighs with the desk (Parcells et al., 1999; Sanders and McCormick, 1993).