Neurophysiologic evaluation of patients with cervical spondylotic myelopathy

Table 4 Correlation of neurophysiological tests with other variables in the patient group

Variables	Age (years)		Disease Duration (month)		Arm length (cm)		mJOA score
Variables	r	p	R	p	R	p	R	p
H-reflex latency (ms)	0.183	0.481	0.145	0.579	0.122	0.642	− 0.093	0.724
H/M amplitude ratio	− 0.188	0.470	− 0.188	0.471	0.271	0.292	0.291	0.257
CuSP (ms)
Onset	− 0.112	0.639	− 0.413	0.071	− 0.183	0.439	0.107	0.652
Duration	0.116	0.627	0.244	0.300	0.133	0.575	0.314	0.178
CoSP (ms)
Onset	0.260	0.268	0.038	0.874	-0.056	0.814	− 0.035	0.884
Duration	0.140	0.557	0.385	0.093	0.177	0.454	0.051	0.830
JOA	− 0.035	0.883	0.035	0.884	− 0.180	0.447	1.0	0.724

CuSP cutaneous silent period, CoSP cortical silent period, mJOA Japanese Orthopedic Association