Fig. 2From: When a joint model should be preferred over a linear mixed model for analysis of longitudinal health-related quality of life data in cancer clinical trialsMean trajectories of the true HRQoL score value in both arms considered in the simulation study (i.e., representation of \(\mathbb{E}\left(\left({Y}^{\star}\Big(t\right)\right)={\beta}_0+{\beta}_1t+{\beta}_2\left\{ arm\times t\right\}\) according to t with t the time in months and arm the treatment arm indicator). HRQoL, health-related quality of lifeBack to article page