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As government-funded universal programs for new parents continue to expand, it is critical to investigate their short- and longer-term effects. The level of knowledge, especially on the effect of group-based interventions, is sparse. This study is the second report from a large trial of a widely implemented universal group-based parenting program in Denmark and includes outcomes on child socio-emotional problems and use of health services. A sample of 1701 unborn children from families representative within the area, were randomized to intervention or care as usual beginning November 2014. From these families, 1268 mothers and 999 partners (mean age 29.4 and 31.19, respectively; 6% migration background) filled in the Ages and Stages Questionnaire. Intention-to-treat-analyses showed fewer socio-emotional problems in the intervention group (between-group difference - 2.34, 95% CI [0.40, 4.30], d = - 0.13) as reported by mothers, but not partners, when children were 10 months old. This finding was transitory (no longer significant at 19 months). No effects were found on health care utilization. The previous report from this trial showed no effects on measures of parenting. In total, these findings serve the purpose of adjusting future expectations to the size and type of effect to be gained from a universal parent program in a resourceful setting. We conclude that even if the Family Startup Program (DK: Familieiværksætterne) 2 was liked, well implemented, and well attended by the parents, the positive effect on children's socio-emotional problems, was too modest to be the argument that can carry the weight of policy going forward. PUBLIC SIGNIFICANCE STATEMENT: This study examined the effects of the Family Startup Program (DK: Familieiværksætterne), a universal, group-based program to support parents during the transition to parenthood. Results showed a modest transitory preventive effect on children's socio-emotional problems and no effects on health care utilization. These findings adjust down previous expectations to the size and type of effects to be gained from universal group-based parent support in a well-resourced setting., (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Interactional processes between child and parents, in particular harsh and coercive parenting practices, have been established as important factors maintaining and shaping the developmental trajectory of disruptive child behavior. The Incredible Years Parent Training (IYPT) is a well-established evidence-based program targeting negative parent-child interactions in families with children exhibiting high levels of disruptive behaviors. There are, however, few studies investigating the effectiveness of the IYPT when implemented in established practice settings independently from research environments. Also, very little evidence exists for the program's effectiveness for school-aged children. The IYPT was administered to consecutive groups of parents (N = 842) across 19 Danish community sites during the period from 2012 to 2019. Pre and post data were collected using the Eyberg Child Behavior Inventory (ECBI). By means of a benchmark approach, the effectiveness of the intervention was compared with that of two European effectiveness randomized controlled trials. Large effect sizes were seen from pre to post for both parent-reported number of problematic disruptive child behaviors (ECBI Problem subscale; d = 1.51, p = 0.000, 95% CI [9.06-10.01]) and frequency of these behaviors (ECBI Intensity subscale; d = 1.15, p = 0.000, 95% CI [29.33-32.73]). Treatment effects found in this study are comparable to or larger than those found in previous effectiveness studies and show the IYPT to be an effective intervention when implemented across a range of different community settings in a large community sample of children across an age span of 2 to 12 years., (© 2023 The Authors. Scandinavian Journal of Psychology published by Scandinavian Psychological Associations and John Wiley & Sons Ltd.)