Seat to Desk Height were too high and mismatched 100% of the students in school A and B and 99% in school C (Fig. 3). As a result of this, children are required to work with shoulder flexion and abduction or scapular elevation, causing more muscle work load, discomfort and pain in the shoulder region (Garcı´a- Molina et al., 1992; Szeto et al., 2002).