Child age
Results of the current meta-analysis indicated no significance in the age of the child and the effect of PMT on child
behavior. Existing literature, however, showed mixed results. A meta-analysis by Lundahl, Risser, and Lovejoy (2006) had a
similar outcome, reporting that outcome of PMT is not affected by the age of child. Other studies have shown that child age
has an effect on the efficacy of PMT on child behavior. Serketich and Dumas (1996) and Maughan et al. (2005) found that PMT
was more effective on older children (age 9–10), although the latter had only two groups in this age level. Conversely, Nowak
and Heinrichs (2008) found that the benefit of PMT was stronger for younger children. These studies, however, do not
attempt to explain the impact of child age on outcomes related to child behavior.