  A large sample of young stellar groups is analysed aiming to investigate
their clustering properties and dynamical evolution. A comparison of the Q
statistical parameter, measured for the clusters, with the fractal dimension
estimated for the projected clouds shows that 52% of the sample has
substructures and tends to follow the theoretically expected relation between
clusters and clouds, according to calculations for artificial distribution of
points. The fractal statistics was also compared to structural parameters
revealing that clusters having radial density profile show a trend of parameter
s increasing with mean surface stellar density. The core radius of the sample,
as a function of age, follows a distribution similar to that observed in
stellar groups of Milky Way and other galaxies. They also have dynamical age,
indicated by their crossing time that is similar to unbound associations. The
statistical analysis allowed us to separate the sample into two groups showing
different clustering characteristics. However, they have the same dynamical
evolution, since the whole sample has been revealed as expanding objects, for
which the substructures seem to have not been erased. These results are in
agreement with simulations that adopt low surface densities and models under
supervirial conditions.
