Table 1. Clinical characteristics of retrolisthesis and anterolisthesis in group R+A.
Group R+A : simultaneous retrolisthesis and anterolisthesis (32 patients). Student's t-test, Mann-Whitney U test, and chi-square test were used for statistical analysis. *p<0.05; interclass correlation (ICC), Cohen's kappa coefficient, and Pearson's coefficient (PC) were used for the reliability of sagittal parameter between two observers. CI : confidence interval