Table 1 Demographic data of patients

Patients No

23

21

–

Gender

(male: female)

15:8

9:12

0.137

Average age (years)

53.3 ± 8.8 (40–68)

57.8 ± 9.2 (39–70)

0.105

Operated levels

C3-C4 and C5-C6: 13;

C4-C5 and C6-C7: 10

C3-C4 and C5-C6: 8;

C4-C5 and C6-C7: 13

0.222

Blood loss (ml)

70.0 ± 15.8

75.4 ± 23.0

0.37

Operative time (min)

126.0 ± 13.2

143.4 ± 17.9

0.001

Follow-up period (months)

34.7 ± 7.6 (24–48)

36.2 ± 5.2 (26–48)

0.447