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Table 2 Intra- and inter-rater reliability of the spinopelvic parameters

From: Sacral incidence to pubis: a novel and alternative morphologic radiological parameter to pelvic incidence in assessing spinopelvic sagittal alignment

  Intra-rater reliability Inter-rater reliability
Examiner A Examiner B Examiner C  
ICC 95% CI ICC 95% CI ICC 95% CI ICC 95% CI
PI 0.97 0.94–0.99 0.98 0.97–0.99 0.99 0.99–1.00 0.98 0.95–0.99
SIP 0.96 0.92–0.98 0.98 0.96–0.99 0.99 0.98–1.00 0.96 0.96–0.98
SS 0.95 0.89–0.97 0.98 0.95–0.99 0.99 0.98–1.00 0.95 0.91–0.98
PT 0.99 0.98–1.00 1.00 0.99–1.00 1.00 0.99–1.00 0.99 0.94–1.00
PIA 0.99 0.99–1.00 0.99 0.99–1.00 0.99 0.99–1.00 0.99 0.98–1.00
LL 0.96 0.92–0.98 0.98 0.96–0.99 0.99 0.99–1.00 0.96 0.92–0.98
  1. ICC intraclass correlation, CI confidence interval, PI pelvic incidence, SIP sacral incidence to pubis, SS sacral slope, PT pelvic tilt, PIA pelvic inclination angle, LL lumbar lordosis