Table 3.

Degenerative Cervical Myelopathy Research by Theme.^a

Theme	Number of papers (%)	r	P	Number of patients (%)	r	P
Surgery	866 (58.3)	−0.05	.819	2 294 089 (55.7)	0.12	.610
Imaging	260 (17.5)	0.02	.947	18 564 (0.4)	−0.76	.001
Prognostication	115 (7.8)	0.45	.042	170 741 (4.1)	0.20	.372
Electrophysiology	91 (6.1)	−0.58	.006	6712 (0.2)	−0.59	.005
Functional Outcome	61 (4.1)	0.53	.015	8777 (0.2)	0.07	.749
Other	45 (3.0)	−0.36	.109	146 309 (3.6)	−0.27	.242
Molecular	27 (1.8)	0.33	.139	2457 (0.1)	0.62	.003
Epidemiology	20 (1.4)	0.33	.149	1 469 402 (35.7)	0.42	.061

^aSurgery and imaging were the most prevalent themes, together accounting for over 75% of papers published between 1995 and 2015. Spearman’s correlation coefficients (r) were calculated to assess trends in percentages of papers and patients for each theme between 1995 and 2015, for which significance testing was conducted and P values are reported. Significant findings are in boldface.