  We examine the recent data and analysis of Natta et al. concerning the
accretion rate on to young stars as a function of stellar mass, and conclude
that the apparently steep dependence of accretion rate on mass is strongly
driven by selection/detection thresholds. We argue that a convincing
demonstration of a physical relationship between accretion and stellar mass
requires further studies which, as is the case for Natta et al., include
information on upper limits, and which quantify the possible incompleteness of
the sample, at both low and high accretion rates. We point out that the
distribution of detections in the ($M, \dot{M}$)-plane can in principle be used
to test conventional accretion disc evolutionary models, and that higher
sensitivity observations might be able to test the hypothesis of accelerated
disc clearing at late times.
