Parent-implemented early language intervention programme for late talkers: parental communicative behaviour change and child language outcomes at 3 and 4 years of age.

At 4 years of age, the majority of children in both groups achieved expressive vocabulary scores within the normal range. However, the mean score for expressive syntax in both groups remained below that of their peers, and 29% of the children still had expressive language scores below the mean range. Ongoing monitoring of LTs' language development is necessary in order to make decisions regarding the timing and nature of intervention.