*3.1. Descriptive Statistics*

The sex distribution was quite similar between samples, with 20 (49%) girls in the group with children with Down syndrome and 28 (52%) in the group of typically developing children (chi-square 0.088, *p*exact = 0.84). There were no significant differences in children's non-verbal mental functioning (*M* = 12.3, *SD* = 5.5 and *M* = 12.6, *SD* = 4.5 for children with Down syndrome and typically developing children, respectively, t(93) = 0.25, *p* = 0.80). Descriptive language data for the children with Down syndrome are presented in Table 1.
