Bailey, Tom, Totsika, Vasiliki, Hastings, Richard P., Hatton, Chris and Emerson, Eric (2019) Developmental trajectories of behaviour problems and prosocial behaviours of children with intellectual disabilities in a population‐based cohort. Journal of Child Psychology and Psychiatry . doi:10.1111/jcpp.13080 (In Press)

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Abstract

Background
The study examined developmental trajectories of prosocial behaviours, internalising and externalising behaviour problems in children with intellectual disabilities (ID) between pre‐school and middle childhood.

Method
Growth models examined the best‐fitting trajectories for internalising and externalising behaviour problems, as well as prosocial behaviours, in 555 children with ID between the ages of three and 11 years from the UK Millennium Cohort Study. Models were also fitted to examine the association of child outcomes with time‐varying maternal psychological distress and life satisfaction. Finally, models were extended to compare trajectories with typically developing children.

Results
Externalising behaviour problems and prosocial behaviours generally improved, whereas internalising problems did not change systematically over time. A cubic trend indicated a slowing down of improvement between ages 5 and 7 for prosocial behaviours and externalising problems. Maternal psychological distress positively co‐varied with internalising and externalising behaviour problems over time. Life satisfaction was not related to changes in child behaviours over time. Compared to behavioural trajectories in typical development, intercepts were worse and trajectories also differed in the ID group.

Conclusions
Over an 8‐year period, externalising behaviour problems and prosocial behaviours of children with ID tended to improve. These behavioural improvements slowed between five and seven years, possibly coinciding with school‐related environmental changes. Children with ID significantly differ from children with typical development in both the initial level of difficulties (exhibiting higher externalising and internalising behaviours, and lower prosocial behaviours) and subsequent development as they age, showing comparatively lower decreases in both externalising and internalising behaviours, and lower increases in prosocial behaviours. Findings also highlight the significant role of maternal mental health problems in the trajectory of child behaviour problems.

Item Type:	Journal Article
Divisions:	Faculty of Social Sciences > Centre for Educational Development, Appraisal and Research (CEDAR)
Journal or Publication Title:	Journal of Child Psychology and Psychiatry
Publisher:	Wiley-Blackwell Publishing Ltd.
ISSN:	0021-9630
Official Date:	21 June 2019
Dates:	Date Event 21 June 2019 Available 13 May 2019 Accepted
Date of first compliant deposit:	16 May 2019
DOI:	10.1111/jcpp.13080
Status:	Peer Reviewed
Publication Status:	In Press
Publisher Statement:	"This is the peer reviewed version of the following article: Bailey, T. , Totsika, V. , Hastings, R. P., Hatton, C. and Emerson, E. (2019), Developmental trajectories of behaviour problems and prosocial behaviours of children with intellectual disabilities in a population‐based cohort. J Child Psychol Psychiatr, which has been published in final form at https://doi.org/10.1111/jcpp.13080. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions."
Access rights to Published version:	Restricted or Subscription Access
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