Table 1 Baseline Characteristics

Gender

Male: 56 Female: 46

Age (yeas)

75.5 ± 5.9

BMI (kg/m2)

23.8 ± 3.4

Medical history

Diabetes mellitus

31 (30.4%)

Hypertension

65 (63.7%)

Hyperlipidemia

56 (55.0%)

Cardiovascular disease

34 (33.3%)

Cerebrovascular disease

11 (10.8%)

Cancer

18 (17.6%)

Duration of conservative therapy before surgery

< 6 months

28 (27.5%)

> = 6 months, < 1 year

17 (16.7%)

> = 1 year, < 3 year

31 (30.4%)

> = 3 years

26 (24.5%)

Spondylolisthesis

35 (34.3%)

Degenerative lumbar scoloiosis

14 (13.7%)

FBSS

8 (7.8%)

Surgical procedure

decompression

59 (57.8%)

decompression + fusion

43 (42.2%)

Surgical time (min)

140.1 ± 90.5

Surgical blood loss (ml)

150.4 ± 168.2

Decompression levels

2.0 ± 0.9

FBSS, Failed back surgery syndrome