The $^{3}_{\Lambda}{\rm H}/\Lambda$ ratio as a function of the mean charged-particle multiplicity ($\langle {\rm d}N_{\rm ch}/{\rm d}\eta\rangle_{|\eta|< 0.5}$) measured at $\sqrt{s} = 13$ TeV for two multiplicity classes (full red circles), together with a previous experimental result in p--Pb collisions  (black cross). Furthermore the CSM thermal model prediction is displayed as black line and the blue and green bands represent the predictions of the two-body and three-body coalescence, respectively. The vertical lines represent the statistical uncertainties, while the vertical boxes are the systematic ones.