Black-hole mass (left column), λ_E (middle column), and L_bol (right column) distributions for the main sample of 677 AGN (top line), and for the three subsamples of AGN selected to investigate dependence on these physical properties: AGN selected via their MIR properties, AGN selected via optical variability, and Type I AGN confirmed by spectroscopy (second-to-bottom lines). Each panel reports the (logarithm of the) median value of the analyzed physical quantity for the corresponding sample; M_BH are in solar mass units and bolometric luminosities are in erg s⁻¹. Details on the selection criteria are reported in Sect. 2.