Fig. 3.

Box graph and scatter diagram. The error bars and three lines in the vertical box in the box graph represent the cut-off values for the 90^th, 75^th, median, 25^th, and 10^th percentiles. A : Comparison of pre- and postoperative curvature of the cervical spine using the Curvature Index (CI). The decrease in CI is indicative of a significant postoperative kyphotic change (^*p=0.002). B : Comparison of pre- and postoperative neurological status as assessed by modified Japanese Orthopedic Association (mJOA) score shows a significant postoperative neurological improvement (^**p=0.001). C : There was no significant correlation between the degree of kyphotic change and rate of improvement (^***p>0.05, ^*correlation coefficient: -0.024 in Spearman's rho, -0.056 in Kendall's tau-b).