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Strengths and Difficulties Questionnaire Added Value Scores:evaluating effectiveness in child mental healthinterventions

Published online by Cambridge University Press:  02 January 2018

Tamsin Ford ,
Judy Hutchings ,
Tracey Bywater ,
Anna Goodman  and
Robert Goodman
Tamsin Ford*
Affiliation:
Institute of Health Services Research, Peninsula College of Medicine and Dentristry, Exeter
Judy Hutchings
Affiliation:
School of Psychology, Bangor University, Gwynedd, Wales
Tracey Bywater
Affiliation:
School of Psychology, Bangor University, Gwynedd, Wales
Anna Goodman
Affiliation:
Department of Epidemiology and Public Health, London School or Hygiene and Tropical Medicine
Robert Goodman
Affiliation:
Department of Child and Adolescent Psychiatry, Kings College London, Institute of Psychiatry, UK
*
Tamsin Ford, Institute of Health Services Research,Peninsula College of Medicine and Dentistry, St Luke's Campus, HeavitreeRoad, Exeter EX2 8UT. Email: tamsin.ford@pms.ac.uk
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Abstract

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Background

Routine outcome monitoring may improve clinical services but remains controversial, partly because the absence of a control group makes interpretation difficult.

Aims

To test a computer algorithm designed to allow practitioners to compare their outcomes with epidemiological data from a population sample against data from a randomised controlled trial, to see if it accurately predicted the trial's outcome.

Method

We developed an ‘added value’ score using epidemiological data on the Strengths and Difficulties Questionnaire (SDQ). We tested whether it correctly predicted the effect size for the control and intervention groups in a randomised controlled trial.

Results

As compared with the a priori expectation of zero, the Added Value Score applied to the control group predicted an effect size of 70.03 (95% CI 70.30 to 0.24, t = 0.2, P = 0.8). As compared with the trial estimate of 0.37, the Added Value Score applied to the intervention group predicted an effect size of 0.36 (95% CI 0.12 to 0.60, t = 0.1, P = 0.9).

Conclusions

Our findings provide preliminary support for the validity of this approach as one tool in the evaluation of interventions with groups of children who have, or are at high risk of developing, significant psychopathology.

Information

Type
Papers
Information
The British Journal of Psychiatry , Volume 194 , Issue 6 , June 2009 , pp. 552 - 558
Copyright
Copyright © Royal College of Psychiatrists, 2009 

Footnotes

The British Child and Adolescent Mental Health Survey 2004 was funded by the Department of Health; the Health Foundation funded the trial of parent training and T.F. wrote this paper while supported on an MRC clinician scientist fellowship. None of these funders had any involvement in the design or analysis of this paper or the construction of the Added Value Score.

Declaration of interest

R.G. and A.G. are directors and part owners of Youthinmind, which provides the www.sdqinfo.com website as a public service in order to make the SDQ freely available in many languages for non-profit use and to publish SDQ norms and the Added Value Score formula.

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