Infrared star-formation rates (SFRs_IR) versus absolute magnitude at 1450 Å, M₁₄₅₀, (top panel) and 150 MHz radio luminosity (bottom panel) for LOFAR radio-detected quasars (RDQs) and radio-undetected quasars (RUQs). Only RDQs (stars) and RUQs (squares) with ≥ 2σ SPIRE-250 μm detections are shown (see Sect. 2.3). For median quasars, the increasing symbol size indicates an increment in the redshift, M₁₄₅₀ absolute luminosity, or 150 MHz radio luminosity. The errors on the horizontal axis indicate the extend of the luminosity bins used. Vertical error bars are the 1σ uncertainties for the SFRs_IR obtained from the SED fitting. The positive correlation between optical and radio luminosities suggest that there is a link between their SFR and AGN activity in median RDQs and RUQs, with indications of star formation being suppressed in the host galaxies of the most luminous radio quasars.