. Eleven studies met inclusion criteria with a total of 540 participants, with 275 in experimental groups and 265 in control groups. The effect of PMT on the disruptive behavior in children with a developmental disability was
significant (g = 0.39). The moderator effects of type of PMT, delivery type and setting, and
administrator level of education were also significant. The moderator effects of child age,
and session number and duration were not significant in this meta-analysis.