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Early regulatory problems (RPs) are associated with childhood internalising and externalising symptoms. Internalising and externalising symptoms, in turn, are associated with adolescent psychopathology (e.g. personality disorders, depression). We examined whether RPs are directly associated with adolescent psychopathology, or whether associations are indirect via childhood internalising and externalising symptoms.

We used data from the Avon Longitudinal Study of Parents and Children. Mothers reported on their child's RPs at 6, 15–18 and 24–30 months, and internalising and externalising symptoms at 4, 7, 8 and 9.5 years. Adolescent psychotic, depression and BPD symptoms were assessed at 11–12 years. Children were grouped by their patterns of co‐developing internalising and externalising symptoms using parallel process latent class growth analysis (PP‐LCGA). Path …