Latent trajectories of early social communication development are associated with autism diagnosis and language outcomes.

In the speech domain, which considers both sounds and words produced, the decreasing class had lower scores than the increasing class, and the medium/parabolic class had scores intermediate between the other two classes across all timepoints from 12 to 24 months [although differences between Classes 1 and 3 drop to only marginally significant ( p = 0.057) at the 15 month timepoint; see Supplementary Table S3 ].

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