45.1 EFFICACY AND COST-EFFECTIVENESS OF INDIVIDUAL VERSUS GROUP-BASED PARENT TRAINING FOR PRESCHOOL ATTENTION-DEFICIT/HYPERACTIVITY DISORDER: A MULTI-CENTER RANDOMIZED CONTROLLED TRIAL

Objectives: The goal of this presentation is to compare the efficacy and cost effectiveness of New Forest Parenting Programme (NFPP)-an individually delivered approach-with a group-based approach (incredible years, IY) and treatment as usual (TAU) in a sample group of preschool children with ADHD. Methods: The Comparison of Preschool Parenting Interventions (COPPI) trial was a three-arm parallel group, randomized controlled trial. The trial recruited 307 preschool children that met standard ADHD diagnostic criteria. Children were block-randomized to NFPP, IY, or TAU on a 3:3:1 ratio. NFPP is a specialist parent-training (PT) program for parents of preschool children with ADHD delivered on a one-to-one basis. The toddler version of IY is a group-based PT program delivered over 12-weekly sessions designed to address problems of challenging and oppositional conduct in young children. Results: In total, 307 participants were randomized (NFPP: N = 134; IY: N = 131; TAU: N = 42). The sample group included a high proportion of single parents (30 percent), low-income families, children with language difficulties (50 percent), and parents with mental health problems (77 percent). No statistically significant differences between NFPP and IY were observed in parent-assessed ADHD symptoms at T2 (primary end point: mean for NFPP, 1.715; mean for IY, 1.724; mean difference, -0.009; 95% CI -0.191 to 0.173; p = 0.921) or T3 or in other secondary or healthrelated outcomes at either T2 or T3. Small benefits of NFPP over TAU were seen for parent-rated ADHD (adjusted mean, 1.693 for NFPP and 1.881 for TAU; mean difference, -0.189; 95% CI -0.380 to 0.003; p = 0.053) and conduct problems (p < 0.05). NFPP was significantly less costly than IY (mean total cost per patient, L1,509 vs. L2,103), with the difference being attributed to higher intervention-related costs of IY. Cost utility analysis, in terms of incremental cost/quality-adjusted life-year (QALY) gained, showed that NFPP was dominant over IY and thus likely to be cost-effective, albeit based on small QALY gain differences. Conclusions: High-quality, group-based PT may be more expensive to deliver than some forms of individually delivered equally efficacious PT programs. Both formats should be available to families.