Participants
UC, ADHD, specific learning disorders, autism
Participant flow through the trial, including numbers screened, numbers recruited, withdrawals and loss to follow-up are shown in Participant flow through the trial.Baseline characteristics of participants (abridged versionFor full baseline characteristics see online Supplementary Table S1.We randomised three clusters from Croatia (two to the UC arm and one to MT) but had to withdraw one of the clusters (MT arm) from the study due to uncertainty regarding the validity of participant consent. The data collected from this site are therefore excluded from the analysis.Includes 42 with specific learning disorders (36 UC, 6 MT), 74 with autism (56 UC, 18 MT) and 97 with ADHD (69 UC, 28 MT).Includes relational problems and other circumstances of personal history.