Ratio of the fraction of stars forming at low metallicity (Z_O/H <  Z_O/H⊙) in different mass ranges using the environment-dependent IMF to that using the universal IMF, as a function of redshift. The shaded area spans between the ratios obtained for the low- (solid lines) and high-metallicity (dashed lines) extreme f_SFR(Z, z) distributions from ChN19. Thus, at redshift z = 1, about 2.5 times more stars with M_* <  1 M_⊙ form in the considered non-universal IMF scenario than in the universal IMF case.