Washington State Institute for Public Policy
Incredible Years: Parent training
Children's Mental Health: Disruptive Behavior
Benefit-cost estimates updated December 2016.  Literature review updated April 2012.
Incredible Years Parent Training (www.incredibleyears.com) is a group, skills-based behavioral intervention for parents of children with behavior problems. The curriculum focuses on strengthening parenting skills (monitoring, positive discipline, confidence) and fostering parents' involvement in children's school experiences in order to promote children's academic, social, and emotional competencies and reduce conduct problems. Training classes include child care, a family meal, and transportation.
BENEFIT-COST
META-ANALYSIS
CITATIONS
The estimates shown are present value, life cycle benefits and costs. All dollars are expressed in the base year chosen for this analysis (2015). The chance the benefits exceed the costs are derived from a Monte Carlo risk analysis. The details on this, as well as the economic discount rates and other relevant parameters are described in our Technical Documentation.
Benefit-Cost Summary Statistics Per Participant
Benefits to:
Taxpayers $849 Benefits minus costs $847
Participants $1,296 Benefit to cost ratio $1.65
Others $459 Chance the program will produce
Indirect ($451) benefits greater than the costs 54 %
Total benefits $2,153
Net program cost ($1,305)
Benefits minus cost $847
1In addition to the outcomes measured in the meta-analysis table, WSIPP measures benefits and costs estimated from other outcomes associated with those reported in the evaluation literature. For example, empirical research demonstrates that high school graduation leads to reduced crime. These associated measures provide a more complete picture of the detailed costs and benefits of the program.

2“Others” includes benefits to people other than taxpayers and participants. Depending on the program, it could include reductions in crime victimization, the economic benefits from a more educated workforce, and the benefits from employer-paid health insurance.

3“Indirect benefits” includes estimates of the net changes in the value of a statistical life and net changes in the deadweight costs of taxation.
Detailed Monetary Benefit Estimates Per Participant
Benefits from changes to:1 Benefits to:
Taxpayers Participants Others2 Indirect3 Total
Crime $12 $0 $27 $6 $45
Labor market earnings associated with high school graduation $178 $392 $179 $59 $807
K-12 grade repetition $4 $0 $0 $2 $5
K-12 special education $71 $0 $0 $36 $106
Health care associated with disruptive behavior disorder $104 $34 $128 $52 $318
Costs of higher education ($18) ($27) ($8) ($9) ($62)
Subtotals $350 $399 $325 $145 $1,219
From secondary participant
Labor market earnings associated with major depression $392 $862 $0 $7 $1,261
Health care associated with major depression $108 $35 $133 $53 $330
Subtotals $499 $897 $133 $61 $1,591
Adjustment for deadweight cost of program $0 $0 $0 ($657) ($657)
Totals $849 $1,296 $459 ($451) $2,153
Detailed Annual Cost Estimates Per Participant
Annual cost Year dollars Summary
Program costs $2,215 2013 Present value of net program costs (in 2015 dollars) ($1,305)
Comparison costs $881 2010 Cost range (+ or -) 10 %
This intervention typically takes place over 12 to 16 weekly sessions. The costs to administer parent training classes per family were provided by Washington State DSHS Children's Administration, 2012. WSIPP also added costs for practitioner training and curriculum for the parent classes, based on the findings of Foster et al., 2007 (training and curricula costs are low on a per-family basis, as curricula are shared between practitioners and distributed across many families who receive the intervention). Based on personal communication with Lisa St. George from Incredible Years (June 2014), we assumed that a practitioner team might use their purchased training and curricula to serve 24 families per year on average, for about five years (120 families served per team). Foster, E.M., Olchowski, A.E., & Webster-Stratton, C.H. (2007). Is stacking intervention components cost-effective? An analysis of the Incredible Years program. Journal of the American Academy of Child and Adolescent Psychiatry, 46(11).
The figures shown are estimates of the costs to implement programs in Washington. The comparison group costs reflect either no treatment or treatment as usual, depending on how effect sizes were calculated in the meta-analysis. The cost range reported above reflects potential variation or uncertainty in the cost estimate; more detail can be found in our Technical Documentation.
Estimated Cumulative Net Benefits Over Time (Non-Discounted Dollars)
The graph above illustrates the estimated cumulative net benefits per-participant for the first fifty years beyond the initial investment in the program. We present these cash flows in non-discounted dollars to simplify the “break-even” point from a budgeting perspective. If the dollars are negative (bars below $0 line), the cumulative benefits do not outweigh the cost of the program up to that point in time. The program breaks even when the dollars reach $0. At this point, the total benefits to participants, taxpayers, and others, are equal to the cost of the program. If the dollars are above $0, the benefits of the program exceed the initial investment.

Meta-analysis is a statistical method to combine the results from separate studies on a program, policy, or topic in order to estimate its effect on an outcome. WSIPP systematically evaluates all credible evaluations we can locate on each topic. The outcomes measured are the types of program impacts that were measured in the research literature (for example, crime or educational attainment). Treatment N represents the total number of individuals or units in the treatment group across the included studies.

An effect size (ES) is a standard metric that summarizes the degree to which a program or policy affects a measured outcome. If the effect size is positive, the outcome increases. If the effect size is negative, the outcome decreases.

Adjusted effect sizes are used to calculate the benefits from our benefit cost model. WSIPP may adjust effect sizes based on methodological characteristics of the study. For example, we may adjust effect sizes when a study has a weak research design or when the program developer is involved in the research. The magnitude of these adjustments varies depending on the topic area.

WSIPP may also adjust the second ES measurement. Research shows the magnitude of some effect sizes decrease over time. For those effect sizes, we estimate outcome-based adjustments which we apply between the first time ES is estimated and the second time ES is estimated. We also report the unadjusted effect size to show the effect sizes before any adjustments have been made. More details about these adjustments can be found in our Technical Documentation.

Meta-Analysis of Program Effects
Outcomes measured Primary or secondary participant No. of effect sizes Treatment N Adjusted effect sizes (ES) and standard errors (SE) used in the benefit-cost analysis Unadjusted effect size (random effects model)
First time ES is estimated Second time ES is estimated
ES SE Age ES SE Age ES p-value
Disruptive behavior disorder symptoms Primary 17 1280 -0.126 0.047 6 -0.060 0.035 9 -0.452 0.001
Major depressive disorder Secondary 4 210 -0.094 0.160 26 -0.049 0.195 27 -0.094 0.557
Attention deficit hyperactivity disorder symptoms Primary 1 50 -0.220 0.234 6 -0.001 0.015 7 -0.595 0.013
Internalizing symptoms Primary 3 187 -0.103 0.116 6 -0.075 0.095 8 -0.348 0.003
Parental stress Secondary 4 202 -0.407 0.168 26 -0.212 0.206 27 -0.605 0.016
Citations Used in the Meta-Analysis

Gardner, F., Burton, J., & Klimes, I. (2006). Randomised controlled trial of a parenting intervention in the voluntary sector for reducing child conduct problems: Outcomes and mechanisms of change. Journal of Child Psychology and Psychiatry and Allied Disciplines, 47(11), 1123-1132.

Gross, D., Fogg, L., Webster-Stratton, C., Garvey, C., Julion, W., & Grady, J. (2003). Parent training of toddlers in day care in low-income urban communities. Journal of Consulting and Clinical Psychology, 71(2), 261-278.

Herman, K.C., Borden, L., Reinke, W.M., & Webster-Stratton, C. (n.d.). The impact of the Incredible Years parent, child, and teacher training programs on children's co-occuring internalizing symptoms. Manuscripted submitted for publication.

Hutchings, J., Gardner, F., Bywater, T., Daley, D., Whitaker, C., Jones, K., . . . Edwards, R.T. (2007). Parenting intervention in Sure Start services for children at risk of developing conduct disorder: Pragmatic randomised controlled trial. British Medical Journal, 334(7595), 678-682.

Jones, K., Daley, D., Hutchings, J., Bywater, T., & Eames, C. (2007). Efficacy of the Incredible Years basic parent training programme as an early intervention for children with conduct problems and ADHD. Child: Care, Health And Development, 33(6), 749-756.

Kim, E., Cain, K.C., & Webster-Stratton, C. (2008). The preliminary effect of a parenting program for Korean American mothers: A randomized controlled experimental study. International Journal of Nursing Studies, 45(9), 1261-1273.

Larsson, B., Fossum, S., Clifford, G., Drugli, M.B., Handegard, B.H., & Morch, W.T. (2009). Treatment of oppositional defiant and conduct problems in young Norwegian children: Results of a randomized controlled trial. European Child & Adolescent Psychiatry, 18(1), 42-52.

Lavigne, J.V., Lebailly, S.A., Gouze, K.R., Cicchetti, C., Pochyly, J., Arend, R., . . . Binns, H.J. (2008). Treating oppositional defiant disorder in primary care: A comparison of three models. Journal of Pediatric Psychology, 33(5), 449-461.

Letarte, M.-J., Normandeau, S., & Allard, J. (2010). Effectiveness of a parent training program 'Incredible Years' in a child protection service. Child Abuse & Neglect, 34(4), 253-261.

Linares, L.O., Montalto, D., Li, M.M., & Oza, V.S. (2006). A promising parenting intervention in foster care. Journal of Consulting and Clinical Psychology, 74(1), 32-41.

McGilloway, S., Ni, M.G., Bywater, T., Furlong, M., Leckey, Y., Kelly, P., Comiskey, C., ... Donnelly, M. (2012). A parenting intervention for childhood behavioral problems: a randomized controlled trial in disadvantaged community-based settings. Journal of Consulting and Clinical Psychology, 80(1), 116-27.

Perrin, E.C., Sheldrick, R.C., McMenamy, J.M., Henson, B.S., & Carter, A.S. (2014). Improving parenting skills for families of young children in pediatric settings: A randomized clinical trial. Jama Pediatrics, 168(1), 16-24.

Reid, M.J., Webster-Stratton, C., & Beauchaine, T.P. (2001). Parent training in Head Start: A comparison of program response among African American, Asian American, Caucasian, and Hispanic mothers. Prevention Science, 2(4), 209-227.

Scott, S., Spender, Q., Doolan, M., Jacobs, B., & Aspland, H. (2001). Multicentre controlled trial of parenting groups for childhood antisocial behaviour in clinical practice. British Medical Journal, 323(7306), 194-198.

Scott, S., O’Connor, T. G., Futh, A., Matias, C., Price, J., & Doolan, M. (2010). Impact of a parenting program in a high-risk, multi-ethnic community: The PALS trial. Journal of Child Psychology and Psychiatry, 51(12), 1331-1341.

Stewart-Brown, S., Patterson, J., Mockford, C., Barlow, J., Klimes, I., & Pyper, C. (2004). Impact of a general practice based group parenting programme: Quantitative and qualitative results from a controlled trial at 12 months. Archives of Disease in Childhood, 89(6), 519-525.

Taylor, T. K., Schmidt, F., Pepler, D., & Hodgins, C. (1998). A comparison of eclectic treatment with Webster-Stratton's parents and children series in a children's mental health center: A randomized controlled trial. Behavior Therapy, 29(2), 221-240.

Webster-Stratton, C., & Hammond, M. (1997). Treating children with early-onset conduct problems: A comparison of child and parent training interventions. Journal of Consulting and Clinical Psychology, 65(1), 93-100.

Webster-Stratton, C., & Herman, K. C. (2008). The impact of parent behavior-management training on child depressive symptoms. Journal of Counseling Psychology, 55(4), 473-484.

Webster-Stratton, C., Kolpacoff, M., & Hollinsworth, T. (1988). Self-administered videotape therapy for families with conduct-problem children: Comparison with two cost-effective treatments and a control group. Journal of Consulting and Clinical Psychology, 56(4), 558-566.

Webster-Stratton, C. (1984). Randomized trial of two parent-training programs for families with conduct-disordered children. Journal of Consulting and Clinical Psychology, 52(4), 666-678.

For more information on the methods
used please see our Technical Documentation.
360.664.9800
institute@wsipp.wa.gov