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. 2019 Nov 20;14(2):176–180. doi: 10.2185/jrm.3008

Table 3. Cut-off values (exercise hours) of musculoskeletal problems.

Lower-grade elementary Higher-grade elementary Junior high school Total



Boys Girls Boys Girls Boys Girls
Stand flexion 1.5 1.5 1.5 1.5 1.5 0 7
One-leg stand 1.5 1.5 1.5 1.5 7 3.5 1.5
Fracture or dislocation 7 7 7 7 7 7 7
Osgood disease 1.5 3.5 0 10 7 7
Baseball elbow 7 7 10 7 7
Spondylolysis 7 1.5 7 1.5 7
Fatigue fracture 1.5 3.5 1.5 10 3.5 7