Figure 4.  Estimated changes of E-ADL test score compared to
baseline using a random effects model. Higher scores indicate
better abilities to perform ADLs. The solid lines represent
effect estimates from a model with an interaction term for time
and group, i.e. where the group effect can change over time. The
dashed lines indicate a model without interaction. In this case,
the group effect is forced to stay constant (as can be seen from
the parallel dashed lines from month 12 to month 22).
Luttenberger et al. BMC Neurology 2012 12:151  
doi:10.1186/1471-2377-12-151 Download authors' original image