The early onset of externalizing behaviour problems (EBP) is associated with negative outcomes later in life, such as poor mental health, substance use, crime, and unemployment. Some children also develop conduct disorder (CD), entailing a high disease and economic burden for both individuals and society. Most studies on the effectiveness and cost-effectiveness of parenting interventions targeting EBP among children have evaluated selective or indicated preventive interventions, or treatment strategies. Evidence on the effectiveness of universally delivered parenting programmes is controversial, partly due to methodological difficulties. The overall aim of this thesis was to 1) address the methodological challenges of evaluating universal parenting programmes, and to 2) employ different health economic methods to evaluate parenting interventions for EBP and CD in children. Study I indicated that offering low intensity levels of Triple P universally, with limited intervention attendance, does not result in improved outcomes, and may not be a worthwhile use of public resources. Study II showed that using the distribution of an outcome variable makes it possible to estimate the impact of public health interventions at the population level. Study III supports offering bibliotherapy to initially target CP in children, whereas Comet could be offered to achieve greater effects based on decision-makers’ willingness to make larger investments. Cope could be offered when targeting symptom improvement, rather than clinical caseness. The economic decision model in Study IV demonstrated that Triple P for the treatment of CD appears to represent good value for money, when delivered in a Group format, but less likely, when delivered in an Individual format. To reduce the burden of mental health problems in childhood, cost-effective and evidence-based interventions should be provided on a continuum from prevention through early intervention to treatment. We believe our results can assist decision-makers in resource allocation to this field.

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