Table 1.

Patient data

	CSM	OPLL
No. of patients	39	29
Male/female	24/15	21/8
Average age (years)	54.4 (35–77)	56.2 (35–71)
Average follow-up period (years)	12.4 (10–14)	12.7 (10–14)
Surgical levels
C2–C7	23	22
C3–C7	11	1
C2–T1	5	4
C3–T1	0	2

CSM cervical spondylotic myelopathy, OPLL ossification of the posterior longitudinal ligament