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Research by Professor Alice Sullivan looked at data from the 1970 British Cohort Â鶹´«Ã½ÊÓƵÍøÕ¾ (BCS70) and the Millennium Cohort Â鶹´«Ã½ÊÓƵÍøÕ¾ (MCS) and found that in both cohorts, children with reported behavioural problems at age five performed more poorly on a vocabulary test as teenagers.