Although
a positive trend was observed, this result was not
statistically significant. It needs to be said that a conclusion
based on this small number of studies is not very
solid, because one additional high-quality study with a
negative result could alter the positive conclusion immediately.
Therefore, this conclusion must be interpreted
with caution. Reviewing the intensities of the
interventions, the conclusion can be drawn that both
minimal and more intense interventions can produce
positive results.