Figure 4

Boxplots of the posturographic parameters: Ankylosing spondylitis (AS) in red Control Subjects (CS) in blue. Horizontal axis depicts the 7 eyes eights (eyes level = e.l., eyes closed = e.c.); from top to bottom vertical axes represent: the ellipse 95% (Ellipse95%), the sway area (Sway Area), the total path (Path), the path in medio-lateral direction (Path ML), the path in anterior-posterior direction (Path AP) (Figure 4a), the total mean velocity (Mean Velocity), the mean velocity in medio-lateral direction (Mean Velocity ML), and the mean velocity in anterior-posterior direction (Mean Velocity AP) (Figure 4b). * Statistical significance ( P < 0.05).