Table 2.

Reliability analysis of sagittal alignment parameters

	Intra-rater reliability			Inter-rater reliability
	ICC	95% CI		ICC	95% CI
C7 Slope	0.99	0.99	0.99	0.95	0.93	0.96
C2-C7 Cobb	0.98	0.97	0.99	0.92	0.90	0.94
C2-S1 SVA	0.90	0.88	0.93	0.86	0.73	0.92
C7-S1 SVA	0.92	0.90	0.94	0.85	0.71	0.91
C2-7PL	0.96	0.95	0.97	0.89	0.86	0.93
T5-T12 Cobb	0.95	0.92	0.96	0.90	0.87	0.92
T10-L2 Cobb	0.93	0.89	0.98	0.89	0.83	0.91
L1-S1 Cobb	0.92	0.87	0.94	0.90	0.88	0.93
PI	0.95	0.93	0.96	0.87	0.79	0.90
PT	0.96	0.95	0.97	0.90	0.87	0.92
SS	0.93	0.91	0.94	0.89	0.86	0.91

Cobb Angle measured using Cobb method, SVA Sagittal Vertical Axis, PL Plumb Line, ICC Intraclass correlation analysis, CI Confidence interval