Fig. 4From: Anatomical cross-sectional area of the quadriceps femoris and sit-to-stand test score in middle-aged and elderly population: development of a predictive equationThe relationship between residuals and mean of the predicted and measured values in the cross-validation group. A solid line is mean of residuals and two dashed lines are two standard deviations of the residual values. Close and open circles indicate males and females, respectively. The residual value is the difference between predicted and measured anatomical cross-sectional area (ACSA) in the quadriceps femorisBack to article page