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A randomised controlled trial of the Incredible Years parent programme with parents of Children at risk of developing Conduct disorder in sure start areas in Wales
ISRCTN ISRCTN46984318
DOI 10.1186/ISRCTN46984318
ClinicalTrials.gov identifier
EudraCT number
Public title A randomised controlled trial of the Incredible Years parent programme with parents of Children at risk of developing Conduct disorder in sure start areas in Wales
Scientific title
Acronym IYCC
Serial number at source 1583/1566
Study hypothesis The diagnosis Conduct Disorder (CD) is used to refer to severely disruptive, aggressive and/or destructive behaviour characterised by a repetitive and persistent pattern of anti-social behaviour in children and adolescents with an estimated prevalence between 5% and 10%.

The hypotheses of this study are:
1. Parenting skills will improve and parental stress and depression will be reduced following parent training.
2. Children whose parents received parent training will show reduced problem behaviour and hyperactivity, and improved self-control.
Lay summary Not provided at time of registration
Ethics approval Ethics approval was granted by North West Wales Health Authority REC on 19/03/2003 (reference: 02/12).
Study design Randomised controlled trial.
Countries of recruitment United Kingdom
Disease/condition/study domain Conduct disorder in pre-school children
Participants - inclusion criteria Families were included in the study if they lived within a designated Sure Start (socially disadvantaged, predominantly low-income) area with a child aged three or four years scoring above the clinical cut-off on either the problem or intensity scale of the Eyberg Child Behaviour Inventory (ECBI).
Participants - exclusion criteria Participants were excluded if children:
1. Were the wrong age
2. Scored below the clinical cut-off on the ECBI
3. If the family were not on a low income
Anticipated start date 01/10/2002
Anticipated end date 31/12/2006
Status of trial Completed
Patient information material
Target number of participants 126, 84 in the intervention group and 42 in the control group
Interventions The study evaluates a parenting programme as an intervention. The 126 participants were randomly allocated to intervention and waiting list control on a 2:1 (intervention to control) basis, after they were stratified by age and sex of index child, using a random number generator. Block randomisation took place, that is, parents were randomly allocated to intervention or control after baseline assessment at each of the 11 areas. Families were seen at baseline, follow up one, two, and three, with each time point being six months apart.

The Webster-Stratton Incredible Years BASIC Parenting Programme was being delivered as the preventive intervention. The intervention was delivered between baseline and follow-up one, with controls being offered the intervention after follow-up one. Researchers collecting questionnaire and observational data at each time point were blind to which group/condition the participants were allocated to.
Primary outcome measure(s) Follow-up scores on the ECBI
Secondary outcome measure(s) Other questionnaire measures which assess parental stress and depression levels, parenting skills, child hyperactivity, child social competence, child self-control, child deviance. In addition parent-child observations were carried out to objectively assess interactions and parent skills and child behaviour.
Sources of funding The Health Foundation (UK) (ref: 1583/1566)
Trial website
Publications 2007 results in: http://www.ncbi.nlm.nih.gov/pubmed/17350966
2013 results in: http://www.ncbi.nlm.nih.gov/pubmed/24350571
Contact name Dr  Judy  Hutchings
  Address School of Psychology
Brigantia Building
University of Wales
  City/town Bangor
  Zip/Postcode LL57 2DG
  Country United Kingdom
  Tel +44 (0) 1248 383625
  Fax +44 (0) 1248 382652
  Email j.hutchings@bangor.ac.uk
Sponsor The Health Foundation (UK)
  Address 90 Long Acre
  City/town London
  Zip/Postcode WC2E 9RA
  Country United Kingdom
  Tel +44 (0) 207 257 8000
  Fax +44 (0) 207 257 8001
  Email info@health.org.uk
  Sponsor website: http://www.health.org.uk/
Date applied 17/08/2006
Last edited 28/04/2014
Date ISRCTN assigned 12/09/2006
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