Several interventions which fall under this category are not discussed in this report, because the evidence regarding effectiveness was not of a sufficiently high quality.
Yn ogystal â’r ymyriadau a archwilir isod, daw ymyriadau amlsynnwyr o dan y categori hwn, oherwydd nad oedd y dystiolaeth ynglŷn ag effeithiolrwydd o ansawdd digon uchel.