biostudies-literatureUnknown59(12)Girard LCUniversity of Oslo<h4>Background</h4>While it is increasingly acknowledged that conduct problems and peer problems often co-occur in development, less is known about the ways in which peer problems may alter the developmental course of conduct problems for distinct subgroups.<h4>Methods</h4>Using data from a large population-based study in Norway (the Bergen Child Study/youth@hordaland; 47.4% males), we estimated group-based trajectories of conduct problems and the presence of time-varying peer problems on the developmental progression of conduct problems between seven and 19 years of age. Risk factors for group membership were also examined.<h4>Results</h4>A 3-group model of conduct problems best fit the data (non-engagers, low-engagers, moderate-stable). The presence of peer problems increased the estimatSocial psychiatry and psychiatric epidemiology2237-2246https://www.ebi.ac.uk/biostudies/studies/S-EPMC11522142biostudies-literatureDevelopmental trajectories of conduct problems and time-varying peer problems: the Bergen child study.PMC11522142Hysing MGirard LCNilsen SAAskeland KGBoe TfalseDevelopmental trajectories of conduct problems and time-varying peer problems: the Bergen child study.<h4>Background</h4>While it is increasingly acknowledged that conduct problems and peer problems often co-occur in development, less is known about the ways in which peer problems may alter the developmental course of conduct problems for distinct subgroups.<h4>Methods</h4>Using data from a large population-based study in Norway (the Bergen Child Study/youth@hordaland; 47.4% males), we estimated group-based trajectories of conduct problems and the presence of time-varying peer problems on the developmental progression of conduct problems between seven and 19 years of age. Risk factors for group membership were also examined.<h4>Results</h4>A 3-group model of conduct problems best fit the data (non-engagers, low-engagers, moderate-stable). The presence of peer problems increased the estimat2024-01-01T00:00:00Z2024 Dec2026-07-15T17:43:35.74Z2025-04-04T03:00:43.833ZS-EPMC115221423842953810.1007/s00127-024-02644-y