DOI: 10.60641/shnv-6v22
title: Teacher Report Form (6-18)

description: The Netherlands Twin Register (NTR) consists of individuals who have agreed to participate in twin-family studies and was established and is managed by the Department of Biological Psychology, VU University Amsterdam (see: https://tweelingenregister.vu.nl/). The NTR was established in 1987 and has enrolled around 120.000 twins and a roughly equal number of their relatives. The majority of twin families have participated one or more times in survey studies on a host of epidemiological variables including social demography, personality, lifestyle, somatic and mental health, and subsamples took part in biomaterial collection (e.g. DNA) and dedicated projects for e.g. neuropsychological, biomarker, and behavioral traits. The recruitment into the NTR is fully inclusive without any restrictions on enrolment. The NTR is committed to actively seek the commitment of its participants to science and their continued involvement in NTR research by maintaining a website, electronic newsletters, and the MijnNTR portal that provides personalized feedback to participants. The NTR resources, e.g. the longitudinal phenotyping, the extended pedigree structures, and the multi-generation genotyping allow for future twin-family research that will contribute to gene discovery, causality modelling, and studies of genetic and cultural inheritance of behavioral traits and mental and physical health. In the CID data catalogue, only the NTR projects for children and adolescents (<18 years of age) have been included. This is refered to as the Young Netherlands Twin Register (YNTR). 
description: The Teacher Report Form (6-18) is part of the Achenbach System of Empirically Based Assessment (ASEBA) taxonomy and is a validated instrument to assess psychiatric symptoms in both clinical and research settings. The ASEBA teacher report version for youths 6 to 18 years of age potentially includes the syndrome scales Anxious/Depressed, Withdrawn/Depressed, Somatic Complaints, Social Problems, Thought Problems, Attention Problems, Rule Breaking Behavior, and Aggressive Behavior, the DSM-oriented scales Depressive Problems, Anxiety Problems, Somatic Problems, Attention Deficit/Hyperactivity Problems, Oppositional Defiant Problems, Conduct Problems, Sluggish Cognitive Tempo, Obsessive-Compulsive Problems, and Stress Problems, the broadband scales Internalizing, Externalizing, and Total Problems, and, optionally, the competence scales Activities, Social, School, and Total Competence.
description: In NTR, from school year 1998-1999 onwards, the teacher survey included the TRF 4-18 constructed in 1991 (Achenbach, T. M. (1991). Manual for the Teacher Report Form/4 - 18 Profile. University of Vermont, Research Center for Children, Youth, & Families.). In 2001, a release of a new version of the TRF (6-18) was published and translated into Dutch (Achenbach, T. M., & Rescorla, L. A. (2001). Manual for the ASEBA School-Age Forms & Profiles. Burlington, VT: University of Vermont, Research Center for Children, Youth, & Families;  Verhulst, F.C., Van der Ende, J. (2013). Handleiding ASEBA-Vragenlijsten voor leeftijden 6 t/m 18 jaar: CBCL/6-18, YSR en TRF. SEBA Nederland). From school year 2005-2006 onwards, this updated version (TRF 6-18) was included in the teacher surveys. The adjustments of the new version consisted of a) replacement of 3 items by new ones (item 5 (4-18: "Behaves like someone of the opposite the sex", 6-18: "There is very little he/she enjoys"), item 28 (4-18 = "Eats and drinks things that are not eatable (no candys)", 6-18: "Breaks rules at school"), and item 99 (4-18: "Tries to be too neat and too clean", 6-18: "Smokes tobacco")), b) new wordings/formulations of items 3, 38, 54, 56a, 56c, 56d, 56f, 58, 61, 109, 113, and c) adding the 3 replaced items of the 4-18 version at the end of the survey (with permission of Verhulst). The NTR only includes the part of the TRF measuring behavioral and emotional problems, thus, the competence scales are not included. The DSM-oriented Sluggish Cognitive Tempo, Obsessive-Compulsive Problems, and Stress Problems scales, and the broadband total problems scale are not available in NTR. Instead of the DSM-oriented scale "Depressive Problems" the NTR has the DSM-oriented scale "Affective Problems".