Two groups of male late talkers, aging 24 - 30 months (LT1) and 33 – 38 months (LT2) at intervention beginning, participated with their mothers for six months to the early intervention INTERACT program. Results indicated that after 6 months, the vocabulary of LT1 group shows a gain significantly higher than the average vocabulary increase of LT2 group, emphasising the importance of an earlier intervention.
