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wave YC_ADHMRI
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam Within the ADHD-MRI project, the genetic and environmental influence on ADHD related neurobiological changes were investigated in monozygotic twins. Twins were selected based on their Child Behavior Checklist Attention Problems (CBCL-AP) scores obtained in the regular YNTR survey waves and divided into three groups: discordant pairs (one affected, one...Created March 28, 2023 • Updated March 28, 2023 -
wave YS_CITO
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The CITO-test is a standardized test for educational achievement that is administered in the final grade (when children are 11 or 12 years old) of elementary school (Eindtoets Basisonderwijs 2002, Arnhem: Citogroep, 2002). It consists of multiple choice items in 4 different educational skills, namely Arithmetic, Language, Study Skills, and Science and...Created March 28, 2023 • Updated March 28, 2023 -
wave YC_BS1
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The main aim of this project was to explore to what extent genetic and environmental factors explain individual differences in brain development and cognition. The study was the start of a Dutch longitudinal study in which twins, their siblings and their parents were assessed at three year intervals. Data collection included psychometric IQ tests, a...Created March 28, 2023 • Updated March 28, 2023 -
wave YC_BS2
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The main aim of this project was to explore to what extent genetic and environmental factors explain individual differences in brain development and cognition. The study was a part of a Dutch longitudinal study in which twins, their siblings and their parents were assessed at three years interval. This project included the measurement three years after...Created March 28, 2023 • Updated March 28, 2023 -
wave YS_DHBQ16
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The Dutch Health and Behavior Questionnaire (DHBQ) was developed at the department of Biological Psychology of the VU University. It is a collection of standardized questions targeting multiple domains. The focus of the survey is on emotional and behavioral problems assessed by the Youth Self-Report (YSR), subjective wellbeing, lifestyle, exercise...Created March 28, 2023 • Updated March 28, 2023 -
wave YE_COG12
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam This project is the fourth measurement of a longitudinal study on the development of intelligence and problem behavior (waves one and two not included in CD2). Intelligence is measured by the Dutch version of the Wechsler Intelligence Scale for Children-Revised (WISC-R). Cortisol and testosterone levels were measured in saliva, which was collected on two...Created March 28, 2023 • Updated March 28, 2023 -
wave YS_7
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam At age 7 information on the twins is collected from both parents and targets the development of emotional and behavior problems, as assessed by the Child Behavior Checklist 6-18 (CBCL). From 2001 onwards, the Conners’ Parent Rating Scale — Revised (CPRS-R) was also included. In addition, these surveys included items on zygosity, medical conditions,...Created March 28, 2023 • Updated March 28, 2023 -
wave YE_FITNSS
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam This study aimed to investigate determinants of adolescent exercise behavior in a sample of healthy twins and their siblings. Body composition was measured, as well as physical fitness (standing jump, hand grip, sit-and reach flexibility, balance tests). Impulsiveness of the subjects was assessed by the delay discounting questionnaire. Regular voluntary...Created March 28, 2023 • Updated March 28, 2023 -
wave YS_12
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The YNTR survey 12 was emailed to both parents of twins around the 12th birthday of the twins. The survey targets the development of emotional and behavior problems, as assessed by the Child Behavior Checklist 6-18 (CBCL). From 2001 onwards, the Conners’ Parent Rating Scale — Revised (CPRS-R) was also included. In addition, these surveys included items on...Created March 28, 2023 • Updated March 28, 2023 -
wave YC_DSC
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The purpose of this project was to investigate the relation between Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) diagnosis of ADHD and Child Behavioral Checklist Attention Problems (CBCL-AP) scores. Twins were selected based on their maternal CBCL-AP scores at ages 7, 10 and 12. Twin pairs were selected if at least one of the twins...Created March 28, 2023 • Updated March 28, 2023 -
wave YS_3
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam In this project surveys are sent to both parents around the 3th birth year of the twin. The survey includes the CBCL 1.5-5, items on zygosity, health, growth data as obtained from the Dutch National Health Services, child care, demographic characteristics, including religious background and parental education and occupation. From 2009 onwards, additional...Created March 28, 2023 • Updated March 28, 2023 -
wave YC_ACTIONBB2
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam This is the Biochemical Study of the ACTION project (Aggression in Children: Unraveling gene-environment interplay to inform Treatment and interventION strategies Consortium; http://www.action-euproject.eu/). The aim of the biochemical study was to further validate the biomarker assays and metabolomics platforms selected during the technical pilot in a...Created March 28, 2023 • Updated March 28, 2023 -
wave YS_TRIP10
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The Child Behavior Checklist (CBCL6_18) is sent to parents of approximately 9 or 10-year old triplets, together with a short general questionnaire on parental and triplet characteristics (e.g., parental employment and religion, triplet school achievements and health).Created March 28, 2023 • Updated March 28, 2023 -
wave YS_TRIP1
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The survey for triplets at age 1 is a 2-page survey that includes items on pregnancy, gestational age, smoking and alcohol consumption during pregnancy, and mode of delivery. The content of this survey is highly comparable with the survey 1 for twins (YS_1).Created March 28, 2023 • Updated March 28, 2023 -
wave YS_TRIP2
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The survey at age 2 for triplets includes information on breastfeeding, attaining miles stones, and growth.Created March 28, 2023 • Updated March 28, 2023 -
wave YE_FITNSS2
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam This study comprised the two-year follow-up of a study aimed to investigate determinants of adolescent exercise behavior in a sample of healthy twins and their siblings. The adolescents were asked to complete an online survey on their current exercise status.Created March 28, 2023 • Updated March 28, 2023 -
wave YS_DHBQ18
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The Dutch Health and Behavior Questionnaire (DHBQ) was developed at the department of Biological Psychology of the VU University. It is a collection of standardized questions targeting multiple domains. The focus of the survey is on emotional and behavioral problems assessed by the Youth Self-Report (YSR), subjective wellbeing, lifestyle, exercise...Created March 28, 2023 • Updated March 28, 2023 -
wave YS_1
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam After registration of newborn twins, which is before the age of 12 months for 89% of the twins, the mother of a twin pair receives the first survey which focuses on conception (spontaneous or otherwise), information from parents themselves (demographics, height, weight), pregnancy (e.g. duration, smoking and drinking behaviors of both parents during...Created March 28, 2023 • Updated March 28, 2023 -
wave YE_ATTEF2
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam This project is the second measurement of a longitudinal study on the source of individual differences of cognition, attention, and executive functioning from preschool to young adulthood. This project included the measurement five years after baseline and additionally recruited new twin pairs and siblings of the twin pairs. Behavioral data were collected...Created March 28, 2023 • Updated March 28, 2023 -
wave YS_TRIP12
Study: NTR Parent cohort: NTR: Young Netherlands Twin Register Publisher: Vrije Universiteit Amsterdam The Child Behavior Checklist (CBCL6_18) is sent to parents of approximately 12-year old triplets, together with a short general questionnaire on parental and triplet characteristics (e.g., parental employment and religion, triplet school achievements and health).Created March 28, 2023 • Updated March 28, 2023
