Table 1 Patient demographics (Data are expressed as mean ± SD).

Patient characteristics

 Age (years)

18.3 ± 5.1*

16.2 ± 3.9*

16.9 ± 3.2

 Sex, n (%)

Male

11 (18.6)

3 (10.3)

2 (11.8)

Female

48 (81.4)

26 (89.7)

15 (88.2)

 BMI (kg/m²)

19.6 ± 2.4

19.5 ± 3.1

19.5 ± 2.1

 Etiology, n (%)

Idiopathic

52 (88.1)

26 (89.7)

15 (88.2)

Others

7 (11.9)

3 (10.3)

2 (11.8)

 Postoperative follow-up duration (months)

63 ± 17*

113 ± 16*

N/A

 Radiographic measures

 Preoperative main curve (degree)

61 ± 14

61 ± 10

52 ± 12*

 Main curve at follow-up (degree)

24 ± 10

25 ± 9

N/A

 Correction rate at follow-up (%)

60.9 ± 10.1

60.1 ± 12.1

N/A

 Number of fixed vertebrae

12.4 ± 1.7

13.2 ± 1.6

N/A

 Number of pedicle screws

17.1 ± 3.2*

11.5 ± 2.9*

N/A

 Number of hooks

1.5 ± 1.4*

5.3 ± 1.7*

N/A

 Number of rod attachments

18.7 ± 2.7*

16.9 ± 2.4*

N/A

 Number of crosslinks

2.0 ± 0.7

1.9 ± 0.4

N/A

 Total rod length (mm)

691 ± 101*

747 ± 72*

N/A

 Total rod surface area (mm²)

131 ± 19*

149 ± 14*

N/A

Surgical characteristics

 Operative time (min)

405 ± 106

394 ± 61

N/A

 Estimated blood loss (ml)

1303 ± 918*

1849 ± 1103*

N/A