Correlations between age, distance, mean main-sequence mass, and multiplicity fraction for the 202 studied open clusters. Top panels: mean main-sequence mass of the open cluster as a function of logarithmic age, colour-coded by their distance (top panel) and by their total multiplicity fraction of systems with q > 0.6 (middle panel). Bottom panel: total multiplicity fraction of systems with q > 0.6 as a function of logarithmic distance, colour-coded by the mean main-sequence mass of each open cluster. The central thick blue line is the running median and the dashed blue lines are the 16th and 84th running percentiles.