Table 1 Patient characteristics and statistical analysis

Number

32

32

32

Sex

0.575

Male

13 (40.6)

9 (28.1)

11 (34.4)

Female

19 (59.4)

23 (71.9)

21 (65.6)

Age (yr)*

55.6 ± 14

58.2 ± 9.5

58 ± 8.6

0.582

Weight (kg)*

66.5 ± 11

65.6 ± 12.2

64.3 ± 13.1

0.76

Height (cm)*

160.2 ± 8.1

159.5 ± 7.9

158.8 ± 7.7

0.776

BMI*

26 ± 4.8

26.4 ± 3.2

26 ± 3.6

0.913

ASA status

0.715

I

10 (31.25)

9 (28.13)

11 (34.37)

II

22 (68.75)

23 (71.87)

21 (65.63)

Number fusion levels

0.703

I

10 (31.2)

15 (46.9)

11 (34.4)

II

15 (46.9)

13 (40.6)

15 (46.9)

III

7 (21.9)

4 (12.5)

6 (18.8)

Duration of surgery (min)*

165.7 ± 46.7

157 ± 33.3

189.2 ± 49.3

0.069

Estimated blood loss (mL)

450 (328.5)

489 (316.3)

587.5 (361.2)

0.246

Intraoperative fentanyl

162.6 (37.5)

157.4 (43.8)

175.9 (37.5)

0.121