• 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 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 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_2

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    This projects gathers maternal report (fathers added in 2014) on motor development, breastfeeding, health, handedness in 2-year old twins and growth data (including height and weight) as obtained from the Dutch National Health Services (from 2010). From 2008 onwards, items on well-being, child care, and temperament were added to the surveys.
    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 YS_TRIP3

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    The Child Behavior Checklist (CBCL1.5-5) is sent to parents of approximately 3-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_TRIP5

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    The Child Behavior Checklist (CBCL1.5-5) is sent to parents of approximately 5-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_5

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    In this project surveys are sent to the mothers around the 5th birth year of the twin. The YNTR survey 5 includes items on child care and school, growth, zygosity, toilet training, asthma and eczema, fine motor coordination, language development, and problem behaviors as assessed by a short version of the Devereux Child Behavior Checklist (DCB). The...
    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_ATTEF1

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    This project aimed to examine the etiology of individual differences on attention problems, attention, executive functioning and cognition in preschool children. This project includes the first measurement of a longitudinal study on the source of individual differences in attention, executive functioning, and cognition in children. Behavioral data was...
    Created March 28, 2023 Updated March 28, 2023
  • wave YS_TRF5

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    Teacher data were collected in 2 sub-groups of 5-year-olds. One as part of the study YE_ATTEF1 (Polderman et al., 2006) and one as a try-out study in 2008. The survey for the primary school teachers includes items on the teacher, class and school, functioning of the child, school performance, and standardized questionnaires on problem behavior, namely the...
    Created March 28, 2023 Updated March 28, 2023
  • wave YE_COG10

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    This study is the third measurement of a longitudinal study on the development of brain function, intelligence and problem behavior, that started in 1992 (waves one and two not included in CD2). A short version of the Revised Amsterdam Children Intelligence Test (RAKIT) was administered to a group of ten-year-old twin pairs.
    Created March 28, 2023 Updated March 28, 2023
  • wave YS_10

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    The YNTR survey 9/10 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, vaccinations, tonsillectomy (from 2005), demographic...
    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 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_TRIP7

    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 7-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_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_TRIP4

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    The Child Behavior Checklist was sent to parents of approximately 4-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_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
  • wave YS_TRF12

    Study:NTR
    Parent cohort:NTR: Young Netherlands Twin Register
    Publisher: Vrije Universiteit Amsterdam
    The survey for the primary school teachers includes items on the teacher, class and school, functioning of the child, school performance, bullying and victimization (from 2010), and standardized questionnaires on problem behavior, namely the Teacher Report Form (TRF), the short version of the Conners’ Teacher Ratings Scale - Revised (CTRS-R), and the...
    Created March 28, 2023 Updated March 28, 2023
You can also access this registry using the API (see API Docs).