Conflict of interest statement: Stone receives the author share of royalties from sales of the Screening Tool for Autism in Two-Year-Olds (STAT).
A randomized controlled trial of Hanen’s ‘More Than Words’ in toddlers with early autism symptoms
Version of Record online: 22 MAR 2011
© 2011 The Authors. Journal of Child Psychology and Psychiatry © 2011 Association for Child and Adolescent Mental Health
Journal of Child Psychology and Psychiatry
Volume 52, Issue 7, pages 741–752, July 2011
How to Cite
Carter, A. S., Messinger, D. S., Stone, W. L., Celimli, S., Nahmias, A. S. and Yoder, P. (2011), A randomized controlled trial of Hanen’s ‘More Than Words’ in toddlers with early autism symptoms. Journal of Child Psychology and Psychiatry, 52: 741–752. doi: 10.1111/j.1469-7610.2011.02395.x
- Issue online: 6 JUN 2011
- Version of Record online: 22 MAR 2011
- Manuscript accepted 22 December 2010
- Autism spectrum disorders;
- Hanen’s ‘More than Words’;
- early intervention
Background: This randomized controlled trial compared Hanen’s ‘More than Words’ (HMTW), a parent-implemented intervention, to a ‘business as usual’ control group.
Methods: Sixty-two children (51 boys and 11 girls; M age = 20 months; SD = 2.6) who met criteria for autism spectrum disorders (ASD) and their parents participated in the study. The HMTW intervention was provided over 3.5 months. There were three measurement periods: prior to randomization (Time 1) and at 5 and 9 months post enrollment (Times 2 and 3). Children’s communication and parental responsivity were measured at each time point. Children’s object interest, a putative moderator, was measured at Time 1.
Results: There were no main effects of the HMTW intervention on either parental responsivity or children’s communication. However, the effects on residualized gains in parental responsivity from Time 1 to both Times 2 and 3 yielded noteworthy effect sizes (Glass’s Δ = .71, .50 respectively). In contrast, there were treatment effects on child communication gains to Time 3 that were moderated by children’s Time 1 object interest. Children with lower levels of Time 1 object interest exhibited facilitated growth in communication; children with higher levels of object interest exhibited growth attenuation.
Conclusions: The HMTW intervention showed differential effects on child communication depending on a baseline child factor. HMTW facilitated communication in children with lower levels of Time 1 object interest. Parents of children who evidence higher object interest may require greater support to implement the HMTW strategies, or may require different strategies than those provided by the HMTW curriculum.