Table 4 Spearman’s coefficients of correlation between activity limitations and MMT

	DMD/BMD LGMD (n = 45)	HN (n = 44)	MD (n = 37)	FSHD (n = 11)	SMA (n = 14)	ALS (n = 18)	Total sample (n = 245)
Upper limb proximal muscles
Shoulder flexion	0.73**	0.27	0.23	0.59	0.45	0.51*	0.47**
Shoulder abduction	0.61**	0.20	0.30	0.66*	0.25	0.38	0.43**
Elbow flexion	0.75**	0.25	0.24	0.53	0.59*	0.10	0.48**
Elbow extension	0.68**	0.26	0.39*	0.40	0.29	0.05	0.40**
Upper limb distal muscles
Wrist flexion	0.43*	−0.16	0.42**	0.01	0.88**	0.18	0.27**
Wrist extension	0.45*	−0.02	0.34*	0.10	0.88**	0.06	0.34**
Finger flexion	0.62**	0.03	0.35*	0.01	0.93**	−0.02	0.17*
Finger extension	0.73**	−0.07	0.53**	0.35	0.94**	0.10	0.31**
Interossei	0.63**	0.21	0.46**	−0.50	0.95**	0.20	0.25**
Lower limb proximal muscles
Hip extension	0.59**	0.04	0.19	0.50	0.73*	0.37	0.39**
Hip abduction	0.58**	0.25	0.01	0.28	0.56	0.39	0.46**
Hip flexion	0.71**	−0.03	0.16	0.47	0.46	0.45	0.44**
Knee extension	0.68**	0.02	0.35*	0.69*	0.58	0.42	0.45**
Knee flexion	0.72**	0.45*	0.18	0.59	0.73*	0.66*	0.50**
Lower limb distal muscles
Ankle dorsiflexion	0.56**	0.28	0.40*	0.84**	0.65*	0.36	0.34**
Ankle plantar flexion	0.75**	0.28	0.51**	0.39	0.40	0.56	0.40**
Toe extension	0.69**	0.20	0.39*	0.77**	−0.03	0.59*	0.35**
Toe flexion	0.83**	0.36	0.14	0.01	0.32	0.88**	0.49**

ALS, amyotrophic lateral sclerosis; BMD, Becker muscular dystrophy; DMD, Duchenne muscular dystrophy; FSHD, facio-scapulo-humeral dystrophy; HN, hereditary neuropathy; LGMD, limb girdle muscular dystrophy; MD, myotonic dystrophy; MMT, Manual Muscle Testing; SMA, spinal muscular atrophy.
*0.05>p>0.01, **p<0.01.