| Description |
This paper mainly aimed to look at whether the developmental delay of children with specific language impairment (SLI) entirely limits to language difficulties or to general cognitive abilities, Executive Functions (EFs). For this purpose, 160 children were recruited and divided into three groups â a group of children with SLI, a group with low language functioning (LLF), and a group with typically developing children (Typical). The main statistical focus was on comparing task performance on EFs tasks among those three groups to see if group differences were significant when age and verbal/nonverbal abilities were controlled for. In doing so, two rounds of hierarchical regression analysis were performed with two steps in each round. Firstly, at Step1, childrenâs age and verbal IQ were controlled for, and, at Step 2, two further dummy coded variables were controlled for in regression analysis, which showed that Step 2 regression model explained more of R squared than Step 1 model (as shown in Table 2 in the original paper). The same analysis procedure was repeated for the second regression analysis as shown in Table 3 except that an additional predictor of non-verbal IQ was added and controlled for.
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