Fig. 4From: Reliability of a new loaded rolling wheel system for measuring spinal stiffness in asymptomatic participantsBland-Altmanplots for between- session agreement in spine stiffness measurements. The central horizontal bias reference lines show the average difference between the measurements between the two testing sessions for the (a) unloaded and (b) loaded conditions. Outer lines show the limits of agreement (Bias ±1.96* standard deviation)Back to article page