Table 2.

Results of mechanography.

	OI	Controls	P
Force tests (Peak Force per Body Weight)
Multiple two-legged hopping	4.08 (0.53)	5.05 (0.69)	< 0.001
Multiple one-legged hopping right leg*	2.64 (0.27)	3.23 (0.34)	< 0.001
Multiple one-legged hopping left leg*	2.57 (0.31)	3.20 (0.43)	< 0.001
Power tests (Peak Power per Body Mass)
Single two-legged jump	38.8 (7.8)	42.7 (10.9)	0.04
Heel-rise test	5.3 (1.2)	6.4 (2.0)	0.01
Chair-rise test†	10.3 (4.3)	13.2 (3.2)	0.03

Osteogenesis imperfecta (OI).

Results are given as mean (SD).

The P value indicates the significance of the difference between patients with OI type I and controls.

^**Two participants in the OI group were unable to generate enough force to perform the test.

^†Two participants in the OI group had invalid results.