Table 1 Radiographic parameters according to location and number of structural curves

PI

47.7 ± 12.1

(3.6–97.2)

47.3 ± 11.4

(15.8–85.9)

0.390

47.2 ± 11.8

(3.6–97.2)

49.1 ± 11.7

(19.4–87.1)

0.022*

47.5 ± 11.8

(3.6–97.2)

PT

9.2 ± 8.9

(− 30.8–44.4)

8.7 ± 8.2

(− 17.6–33.9)

0.210

8.8 ± 8.8

(− 30.8–44.4)

9.4 ± 8.1

(− 13.6–29.7)

0.260

9.0 ± 8.6

(− 30.8–44.4)

SS

38.6 ± 9.3

(12.6–69.3)

38.6 ± 8.8

(9.4–65.6)

0.280

38.3 ± 9.2

(9.4–69.31)

39.6 ± 8.4

(21.5–65.6)

0.041*

38.6 ± 9.1

(9.4–69.3)

PI-LL

−0.96 ± 12.7

(− 53.2–36.3)

− 3.2 ± 11.6

(− 40.0–29.9)

0.002*

−2.3 ± 12.5

(− 53.2–36.3)

−0.29 ± 11.2

(− 28.9–34.7)

0.049*

−1.9 ± 12.3

(− 53.2–36.3)

LL

48.7 ± 11.9

(14.2–90.0)

50.5 ± 12.2

(9.1–83.5)

0.003*

49.5 ± 12.4

(9.1–90.0)

49.4 ± 10.7

(18.7–78.2)

0.497

49.5 ± 12.1

(9.1–90)

TK

17.3 ± 11.0

(− 23.8–71.1)

19.4 ± 9.7

(− 24.7–51.0)

< 0.001*

18.6 ± 10.3

(− 10.6–71.1)

16.7 ± 11.5

(− 24.7–58.9)

0.012*

18.2 ± 10.5

(− 24.7–71.1)

Major curve

27.2 ± 10.7

(10.1–85.8)

26.2 ± 9.3

(10.4–69.8)

0.091

24.2 ± 8.2

(10.1–70.7)

39.1 ± 10.2

(24.6–85.8)

< 0.001*

27.0 ± 10.4

(10.1–85.8)

Minor curve 1

21.4 ± 9.7

(3.6–79.9)

21.5 ± 8.4

(0.8–61.1)

0.190

33.1 ± 7.8

(25.0–79.9)

21.4 ± 9.2

(0.8–79.9)

Minor curve 2

17.7 ± 6.8

(1.8–31.9)

19.5 ± 8.1

(7.7–33.3)

0.360

29.1 ± 2.5

(25.5–33.3)

18.1 ± 7.0

(1.8–33.3)