Table 1 Comparison of patient characteristics between K-line (+) group and K-line (-) group

Age

59.5 ± 11.8

62.8 ± 10.3

0.293

Gender (M/F)

63/12

23/10

0.119

BMI

24.9 ± 3.5

25.4 ± 3.6

0.641

Classification of OPLL

0.748

 Continuous

15

7

 Segmental

10

3

 Mixed

39

20

 Localized

11

3

 Hypertension

32 (42.7%)

18 (54.5%)

0.298

 Diabetes mellitus

22 (29.3%)

12 (36.4%)

0.505

 Cardiovascular disease

15 (20%)

8 (24.2%)

0.618

OOR (%)

42.3 ± 10.1

49.5 ± 15.3

0.006

C2-7 lordosis (°)

12.4 ± 9.7

9.9 ± 10.1

0.217

Preoperative Hb (g/L)

13.2 ± 1.8

13.8 ± 1.6

0.650

Preoperative HCT (%)

40.1 ± 3.2

41.5 ± 2.8

0.598