“…We hypothesized that IY-Parent and IY-Child programs will be effective in improving parenting skills, reducing child behavior problems, and consequently reducing the risk of child abuse. Also, IY effects on related variables such as parenting stress and parents' psychological distress were explored because, although they have been identified as relevant risk factors for child maltreatment (Barnhart & Maguire-Jack, 2016;Schaeffer et al, 2005;Stith et al, 2009), evidence about the effects of parenting programs on such variables is mixed, with some studies showing such effects (Barlow et al, 2014;Berliner et al, 2015;Furlong et al, 2012;Hutchings et al, 2007Hutchings et al, , 2012Pinquart & Teubert, 2010;Weber et al, 2019) and others failing to confirm them (Chen & Chan, 2016;Dedousis-Wallace et al, 2021;Leijten et al, 2017). Finally, we explored whether post-intervention changes were maintained after the intervention ended, and the influence of family sociodemographic characteristics, parent participation in the program (couple vs. only one parent), and program attendance on intervention effects.…”