*2.1. Participants*

The study was conducted in a special educational facility in the Podkarpackie Region, Poland, and involved 60 children with mild intellectual disability, mean age 11 years ± 2.3 years. Eligibility criteria included: Mild intellectual disability (intelligence quotient of 50–70 according to Wechsler Intelligence Scale) [26,27], special school education, age 10–13 years, and parent's/legal guardian's consent to participate. The study protocol excluded children with moderate to severe intellectual disability with cognitive deficits impairing the ability to understand and follow instructions. Other exclusion criteria were defined as follows: Co-existing autism, cerebral palsy, total visual and hearing impairment, muscular dystrophy and neurological disorders such as brain injury and epilepsy. Prospective subjects were disqualified from the study if their parents/legal guardians failed to gran<sup>t</sup> consent for participation.

### *2.2. Flow of the Subjects through the Study*

One hundred children were examined successively, as they were admitted to a special educational facility in the Podkarpackie Region, Poland. Ultimately 60 children were enrolled for the study. Out of the 40 children who were not qualified for the programme, 28 failed to meet the inclusion criteria, and 12 refused to participate. All the subjects completed the final examination. Figure 1 shows the flow of the subjects through the study.

**Figure 1.** Flow of subjects through the study.

### *2.3. Study Design*

Single blind trial design was applied with randomised assignment of participants to one of the two parallel groups comprising a total of 60 children with intellectual disability, attending the same special educational facility in the Podkarpackie Region, Poland. Simple randomization was used, i.e., randomisation based on a single sequence of random assignments. The most common and basic method of simple randomisation was applied, which involved flipping a coin [28], the side of the coin (i.e., heads—DTA group, tails—control group) determined the assignment of each subject. First degree randomisation, i.e., random selection of subjects to two groups, the DTA group and the control group, whereby the children were allocated either to the group receiving DTA (the DTA group—30 children, 19 girls and 11 boys) or to the group that did not participate in the DAT program (the control group—30 children, 20 girls and 10 boys). Subsequently the DAT group was randomly divided by second degree randomisation, i.e., the subjects were assigned to five therapeutic subgroups, each comprising 6 children, relative to the procedures applied in the DAT. The subgroups had common characteristics in terms of functionality level (all the children presented the same functionality level in activities of daily living expressed by Barthel Index of 80–85 points), and cognitive level (mild intellectual disability—intelligence quotient of 50–70 according to Wechsler Intelligence Scale). All the children met all the inclusion criteria. The DAT program was continued for 10 months, with 45-min sessions taking place once a week.

### *2.4. Study Protocol*

The protocol of this randomised study was approved by the local Bioethics Commission of the Medical Faculty (4 February 2017). The data presented in this article were obtained in a two-armed randomised controlled trial. Informed consent for the children's participation in the study was obtained in writing from their parents or legal guardians. Experimental conditions were in compliance with the Declaration of Helsinki. No adverse events were observed during the study. Inclusion/exclusion criteria were met. No intentional deviations from the protocol were observed during the study.
