Fig. 2From: How important is the linearity assumption in a sample size calculation for a randomised controlled trial where treatment is anticipated to affect a rate of change?Mean trajectories over time in participants not receiving the trial treatment (left-hand panel); spaghetti plots for 20 people not on the trial treatment, with a residual error of \({\sigma }_{e}^{2}=0.15\) (right-hand panel)Back to article page