NTR Research Projects

The NTR data showcase contains information on a large number of research projects that have been conducted by the NTR over the years. Each project has its own project code*.

Below is an overview of all projects (and corresponding project codes) currently available in the data showcase. When searching the data showcase, you can filter the results by project code(s) if you are interested in data from (a) specific project(s).

For a brief summary of the sample size and composition per project, see this overview file. To view more extensive documentation for a project, click on the project code (please note: this is a work in progress. Documentation is not yet available for all projects). 

Participant overlap between projects

To get a rough indication of the overlap in participants between any two NTR projects, please consult this overlap table. This should give you an idea of how many data points will be available if you combine variables from different projects. Keep in mind that there may be missing data within a project: this information can be viewed in the data showcase (click on the question mark button to see the item summary). If you need more detailed information (e.g., on participant overlap between more than two projects), please contact NTR data management.


Project code*Project description


NC_IDALLBasic person and family information (e.g. sex, zygosity, family structure)


Surveys


AS_0_1ANTR survey 0.1 (general survey for new participants; 2008 - 2013)


AS_0_2ANTR survey 0.2 (general survey for new participants; 2015 -)


AS_1ANTR survey 1 (health, lifestyle, personality; 1991)


AS_2ANTR survey 1 (health, lifestyle, personality; 1993)


AS_3ANTR survey 3 (personality, lifestyle and health; 1995)


AS_4ANTR survey 4 (health, lifestyle, personality; 1997)


AS_5ANTR survey 5 (health, lifestyle, personality, substance use; 2000)


AS_6ANTR survey 6 (health, lifestyle, personality, exercise; 2002)


AS_7ANTR survey 7 (health, lifestyle, personality, borderline; 2004)


AS_8ANTR survey 8 (health, lifestyle, personality, substance abuse; 2009)


AS_9ANTR survey 9 (health, lifestyle, personality, anxiety and pain; 2011)


AS_10ANTR survey 10 (health, lifestyle, personality, substance use; 2012)


AS_11ANTR survey 11 (food preference; 2014)


AS_12ANTR survey 12 (BIONIC; major depressive disorder; 2015)


YS_1YNTR survey age 1 (maternal report; focus on conception, pregnancy, birth and health characteristics of their twins)


YS_2YNTR survey age 2 (parental report; focus on motor development, growth data, breastfeeding and handedness. From 2008 well-being and temperament were included)


YS_3MYNTR survey age 3, rated by mothers (focus on behavioral and emotional behavior (CBCL), health and growth. From 2009 well-being, leisure and sport activities, and life events of their parents were included)


YS_3VYNTR survey age 3, rated by fathers (focus on behavioral and emotional behavior (CBCL), health and growth. From 2009 well-being, leisure and sport activities, and life events of their parents were included)


YS_5YNTR survey age 5 (parental report; focus on behavioral and emotional behavior (Short version of Devereux and from 2015 the CBQ), child care and school, growth, toilet training, asthma and eczema and fine motor coordination)


YS_7MYNTR survey age 7, rated by mothers (focus on behavioral and emotional behavior (CBCL and Conners), health and growth, school, physical activity and leisure time)


YS_7VYNTR survey age 7, rated by fathers (focus on behavioral and emotional behavior (CBCL and Conners), health and growth, school, physical activity and leisure time)


YS_10MYNTR survey age 9/10, rated by mothers (focus on behavioral and emotional behavior (CBCL and Conners), health and growth, school, physical activity and leisure time)


YS_10VYNTR survey age 9/10, rated by fathers (focus on behavioral and emotional behavior (CBCL and Conners), health and growth, school, physical activity and leisure time)


YS_12MYNTR survey age 12, rated by mothers (focus on behavioral and emotional behavior (CBCL and Conners), health and growth, school, physical activity and leisure time. From 2008 items well-being and parenting are included)


YS_12VYNTR survey age 12, rated by fathers (focus on behavioral and emotional behavior (CBCL and Conners), health and growth, school, physical activity and leisure time. From 2008 items well-being and parenting are included)


YS_DHBQPDutch Health and Behavior Questionnaire, pilot (Self report twins and their siblings with focus on emotional and behavioral problems (YSR), subjective wellbeing, lifestyle, exercise behavior, sedentary behavior, and family functioning)


YS_DHBQ14Dutch Health and Behavior Questionnaire, adolescents age 14 (Self report twins and their siblings with focus on emotional and behavioral problems (YSR), subjective wellbeing, lifestyle, exercise behavior, sedentary behavior, and family functioning)


YS_DHBQ16Dutch Health and Behavior Questionnaire, adolescents age 16 (Self report twins and their siblings with focus on emotional and behavioral problems (YSR), personality (NEO), subjective wellbeing, lifestyle, exercise behavior, sedentary behavior, and family functioning)


YS_DHBQ18Dutch Health and Behavior Questionnaire, adolescents age 18 (Self report twins and their siblings with focus on emotional and behavioral problems (YSR), subjective wellbeing, lifestyle, exercise behavior, sedentary behavior, and family functioning)


YS_TRF5Teacher report  of twins (age 5) (items on the teacher, class and school, functioning of the child, school performance, and on problem behavior (TRF and Conners))


YS_TRF7Teacher report of twins (age 7) and their siblings (items on the teacher, class and school, functioning of the child, school performance, and on problem behavior (TRF and Conners)).


YS_TRF10Teacher report of twins (age 10) and their siblings (items on the teacher, class and school, functioning of the child, school performance, and on problem behavior (TRF and Conners))


YS_TRF12Teacher report of twins (age 12) and their siblings (items on the teacher, class and school, functioning of the child, school performance, and on problem behavior (TRF and Conners))


NS_TM05NTR Twin mothers survey (focus on familial twinning, pre-pregnancy information and maternal characteristics)


Non-survey projects


NA_AGGNTR neurocognitive testing (WebCNP)


NE_NCHANTR neurocognitive testing (WebCNP)


YS_VALYNTR phenotypic reference panel (Parental report: Additional survey to YS_10M and YS_10V with the complete SDQ, selection of A-TAC items and items on Life Events) 


YC_BS1YNTR Brainscale 1 MRI experiment (First measurement (age 9) of a longitudinal study on individual differences in brain development (MRI) and cognition)


YC_BS2YNTR Brainscale 2 MRI experiment (Second measurement (age 12) of a longitudinal study on individual differences in brain development (MRI) and cognition)


YC_BS3YNTR Brainscale 3 MRI experiment (Third measurement (age 17) of a longitudinal study on individual differences in brain development (MRI) and cognition)


YE_ATTEF1YNTR study on Attention and Cognition 1 (First measurement (age 5) of a longitudinal study on individual differences in attention and cognition. Focus on attention problems, attention, cognition, and executive functioning)


YE_ATTEF2YNTR study on Attention and Cognition 2 (Second measurement (age 12) of a longitudinal study on individual differences in attention and cognition. Focus on problems, attention, cognition, and executive functioning)


YE_ATTEF3YNTR study on Attention and Cognition 3 (Third measurement (age 18) of a longitudinal study on individual differences in attention and cognition. Focus on cognition and physiological measurements)


YC_ACTIONYNTR study on metabolomics biomarkers and childhood aggression


* Each project has its own project code, consisting of two letters and a suffix. The first letter of the project code reflects the type of population a project was conducted in: A is a project in adult twins and their family members (ANTR), Y indicates a project in young twins and their family members (YNTR). An N indicates both ANTR and YNTR. Young in the past meant under 18 but now generally refers to children and adolescents up to age 16. The second letter reflects the main type of data collected within the project, e.g. “S” indicates a survey, “E” is an experimental study, “B” is a biobanking project, and a “C” is used when a combination of several types of data was collected. The suffix is usually a short  descriptive string, such as a wave number and/or an abbreviation of the project name. So for example, “AS_1” is the adult survey, first wave.