Table 3. The activity ratio between the three muscles changes in response to external fixation

Muscle ratio	NONE	FP	t	p	Effect size
GM/Rt.MF	0.88±0.59	1.48±1.06	–4.375	0.001*	0.70
GM/Lt.MF	1.05±0.61	2.26±1.67	–3.274	0.006*	0.96
GM/BF	2.63±1.10	3.34±1.25	–4.499	0.001*	0.60

Rt.MF, right multifidus; Lt.MF, left multifidus; GM, gluteus maximus; BF, biceps femoris; NONE, no fixation; FP, fixation on pelvic.
Data are expressed as mean±SD.
p<0.05.