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Table 1 Demographic Characteristics and Operative Data

From: Perioperative outcome and complications following single-staged Posterior Spinal Fusion (PSF) using pedicle screw instrumentation in Adolescent Idiopathic Scoliosis (AIS): a review of 1057 cases from a single centre

Demographics

Age 10–18

Age 19–30

Total

p-value

Sex, n (%)

 Male

110 (10.4)

30 (2.8)

140 (13.2)

0.09

 Female

773 (73.1)

144 (13.6)

917 (86.8)

Age (year)

14.3 ± 1.9

22.5 ± 3.2

15.6 ± 3.7

< 0.01

Menarche age (year)

12.3 ± 1.2

12.8 ± 1.2

12.4 ± 1.2

< 0.01

Distribution by Lenke type, n (%)

 1

413 (39.0)

83 (7.9)

496 (46.9)

0.48

 2

189 (17.9)

38 (3.6)

227 (21.5)

 3

23 (2.2)

8 (0.8)

31 (2.9)

 4

27 (2.6)

3 (0.3)

30 (2.8)

 5

159 (15.0)

25 (2.4)

184 (17.4)

 6

72 (6.8)

17 (1.6)

89 (8.4)

Height (cm)

156.4 ± 7.7

160.0 ± 8.1

157.0 ± 7.8

< 0.01

Weight (kg)

45.2 ± 8.8

50.0 ± 9.1

46.0 ± 9.0

< 0.01

Body mass index (kg/m2)

18.4 ± 3.1

19.5 ± 3.4

18.6 ± 3.2

< 0.01

Body surface area (m2)

1.4 ± 0.2

1.5 ± 0.2

1.4 ± 0.2

< 0.01

Preoperative haemoglobin (g/dL)

13.7 ± 1.2

13.6 ± 1.4

13.7 ± 1.2

0.10

Preoperative major curve Cobb angle (°)

66.7 ± 17.3

65.4 ± 16.5

66.5 ± 17.1

0.36

Risser sign, n (%)

3.3 ± 1.5

4.9 ± 0.6

3.6 ± 1.5

< 0.01

 0

73 (8.3)

0

73 (6.9)

 

 1

49 (5.5)

0

49 (4.6)

 

 2

120 (13.6)

0

120 (11.4)

 

 3

102 (11.6)

0

102 (9.6)

 

 4

395 (44.7)

12 (6.9)

407 (38.5)

 

 5

144 (16.3)

162 (93.1)

306 (28.9)

 

Operative Data

 Number of screws

14.1 ± 2.3

14.3 ± 2.4

14.1 ± 2.4

0.33

 Number of levels fused

10.3 ± 2.2

10.3 ± 2.1

10.3 ± 2.2

0.84

 Proximal level of fusion, median

T3

T3

T3

–

 Distal level of fusion, median

L3

L2

L2

–

 Screw density (screws/vertebral level)

1.27 ± 0.20

1.29 ± 0.24

1.27 ± 0.21

0.20

 Duration of surgery (min)

143.9 ± 48.4

161.1 ± 52.0

146.8 ± 49.4

< 0.01

 Postoperative haemoglobin (g/dL)

10.9 ± 1.5

10.9 ± 1.6

10.9 ± 1.5

0.96

 Total blood loss (mL)

945.4 ± 535.7

990.5 ± 502.5

952.9 ± 530.4

0.31

 Estimated blood volume (mL)

3103.0 ± 499.7

3376.1 ± 539.0

3148.0 ± 516.1

< 0.01

 Total blood loss/estimated blood volume (%)

30.8 ± 17.4

29.9 ± 15.9

30.7 ± 17.1

0.51

 Allogeneic blood transfusion n (%)

46 (4.3)

7 (0.7)

53 (5.0)

0.51

 Length of stay (days)

3.4 ± 0.9

3.6 ± 1.2

3.5 ± 0.9

0.12

 Estimated blood salvage (ml)

485.6 ± 305.6

505.5 ± 297.7

488.9 ± 304.3

0.43