Table 1.

Demographic characteristics

Characteristics	Value
Patients (n)	60
Mean age (years), mean ± SD	55.9 ± 8.1
Sex (female/male)	24/36
Index level (n)
C3–4	1
C4–5	13
C5–6	39
C6–7	7
Follow up (months), mean ± SD	135.1 ± 16.1