Infrared star formation rate (SFR_IR) of LOFAR radio-detected quasars (RDQs) and LOFAR radio-undetected quasars (RUQs) versus redshift. The filled stars and squares and associated vertical error bars show the median value in each bin. The horizontal error bars indicate the extend of the redshift bins used. The marron stars and cyan squares show the results for the RDQs and RUQs, respectively, with ≥ 2σ SPIRE-250 μm detections. The solid lines represent the predicted SFRs as a function of redshift derived for the median quasars using the star-formation main sequence (SFMS) relation by Schreiber et al. (2015). The cyan and orange shaded regions indicate the uncertainty intervals of the fitting provided by Schreiber et al. (2015). The vertical errror bars indicate the errors of the SFR_IR estimates obtained using the SED fitting, while the horizontal errors indicate the size of the redshift intervals considered. There is a good agreement between the measured median SFR_IR for RDQs and RUQs, and the SFMS predictions considering the width of the redshift bins employed and the intrinsic scatter of the SFMS relation.