Table 2.

Mixed model ANOVA (with a subject-specific random intercept) for the shape parameter, (α) and the rate parameter, (log(β)), for a gamma distribution fitted to the backscattered echo intensity of the rectus femoris muscle. The two factors considered are abnormalities due to CP compared to healthy volunteers, and muscle contraction (MVIC) compared to relaxed muscle. Significant differences are seen in both parameters for CP compared to healthy volunteers at the 5% level after Bonferroni correction for multiple comparisons. Significant differences are seen in the rate parameter for muscle contraction at the 5% level after Bonferroni correction for multiple comparisons. No significant interaction is observed. Log-transformation was applied to the rate parameter to approximate normality. Residual analysis shows that the mixed effects model fits the data well.

Source of variation	α	β
CP	<1E-4*	0.0061*
MVIC	0.0617	0.0015*
Interaction CP*MVIC	0.9539	0.5854