Table 4.

Comparisons of Radiographs Measurements Between Control and CASP-S Group

	Control group / CASP-S group
	One, two, three level (n=61) Median (interquartile)		One level subgroup (n=32) Median (interquartile)		C5/6 fusion sub-subgroup (n=28) Median (interquartile)
Distance from fusion mass to C2 plumb line	10(5–14) / 7(3–13)	p=0.233*	10(6.5–14.5) / 7.5(3–13)	p=0.092*	11(8–16) / 8.5(5–14)	p=0.086*
Distance from fusion mass to C7 plumb line	11(8–15) / 9(6–13)	p=0.095*	11(8–14) / 9(6–11)	p=0.053*	11(7–13) / 8(6–9)	p=0.021*
Distance from C2 to C7 sagittal plumb line	20(16–28) / 17(10–27)	p=0.117*	20(18–27) / 17(10–23)	p=0.044*	20(18–28) / 17(11–22)	p=0.032*
Sagittal slope angle of superior endplate of vertebrae caudally adjacent to fusion mass	28(24–34) / 26(21–32)	p=0.112	28(24–34) / 24(21–32)	p=0.058	29(24–34) / 24(21–31)	p=0.034
T1 sagittal slope angle	30(26–35) / 28(23–33)	p=0.100	30(26–34) / 26(22–33)	p=0.075	30(27–34) / 25(22–33)	p=0.049
Caudally adjacent disc angle	−4(−6, −1) / −3(−7, −1)	p=0.496*	−4(−6, −2) / −3(−8, −1)	p=0.808*	−4(−5, −2) / −3(−7, −1)	p=0.664*
Alignment of the fusion mass	−1(−6,1) / 0(−8,5)	p=0.564	0(−3,3) / 0(−7,7)	p=0.808	0(−2,4) / 0(−5,8)	p=0.856
Overall cervical sagittal alignment	22(−28, −13) / −18(−24, −9)	p=0.101	−21(−25, −10) / −15(−23, −7)	p=0.424	−21(−25, −10) / −14(−22, −5)	p=0.328

Note : t-test was used due to the normal distribution.

^*Wilcoxon-Mann-Whitney test was used if variables are not normal distributed.