Diagrams summarizing the outflow-activity associations of the radio-jet candidates studied in this work. The integer numbers indicate the number radio-jet candidates in a specific group (see Table 3). Thetop diagram summarizes the association of the radio-jet candidates with molecular outflows, masers, and EGOs (see Sect. 4, for EGOs we only consider an association if the source is labeled “Y” in Table 3). Bottom row diagrams: results regarding the thermal (spectral index > − 0.1) and nonthermal (spectral index <−0.1) properties of the radio continuum emission. The number of sources for which we could not derive the spectral index is also indicated.