. 2021 Nov 1;64(6):913–921. doi: 10.3340/jkns.2021.0011

Table 4.

Correlation analysis among radiologic parameters

		Os	C2s	C7s	T1s	T1s-CL	O-C2A	C2-7A	O-C7A	USS	LSS	SA	CVA	C2-7SVA
Pre-OP
	C2s	0.34^*	1	0.09	0.08	-0.96^*	-0.77^*	0.72^*	0.13	0.55^*	0.14	0.34^*	0.67^*	-0.71^*
	T1s-CL	-0.37^*	-0.96^*	0.05	-0.08	1	0.72^*	-0.76^*	-0.28^*	-0.39^*	0.05	-0.37^*	-0.56^*	0.60^*
	C2-7A	0.20^*	0.72^*	-0.61^*	-0.58^*	-0.76^*	-0.57^*	1	0.63^*	0.13	-0.55^*	0.71^*	0.24^*	-0.31^*
	T1S	0.13	0.08	0.94^*	1	-0.08	0.01	-0.58^*	-0.70^*	0.35^*	0.87^*	-0.64^*	0.39^*	-0.28^*
	C7s	0.07	0.09	1	0.94^*	0.05	-0.04	-0.61^*	-0.76^*	0.31^*	0.90^*	-0.66^*	0.39^*	-0.33^*
Post-OP
	C2s	0.43^*	1	0.08	0.17	-0.88^*	-0.72^*	0.65^*	0.16	0.43^*	0.05	0.32^*	0.27^*	-0.60^*
	T1s-CL	-0.45^*	-0.88^*	0.02	-0.18	1	0.60^*	-0.65^*	-0.27^*	-0.37^*	0.05	-0.36^*	-0.19	0.49^*
	C2-7A	0.18	0.65 ^*	-0.69 ^*	-0.56^*	-0.65^*	-0.54^*	1	0.73^*	-0.02	-0.65^*	0.74^*	0.12	-0.16
	T1S	0.13	0.17	0.91^*	1	-0.18	-0.08	-0.56^*	-0.71^*	0.42^*	0.82^*	-0.54^*	0.03	-0.38^*
	C7s	0.14	0.08	1	0.91^*	0.02	0.01	-0.69^*	-0.81^*	0.43^*	0.91^*	-0.67^*	0.09	-0.36^*

Statistical significance (p<0.05).

Os : occipital slope, C2s : C2 slope, C7s : C7 slope, T1s : T1 slope, T1s-CL : T1 slope minus cervical lordosis, O-C2A : O-C2 angle, C2-7A : C2-7 angle, O-C7A : O-C7 angle, USS : upper segmental slope, LSS : lower segmental slope, SA : segmental angle, CVA : cranio-vertebral angle, C2-7 SVA : C2-7 sagittal vertical axis, OP : operation