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_IDALL | Basic person and family information (e.g. sex, zygosity, family structure) |
| NA_AGG | Aggregated variables – combined and checked across multiple projects, e.g. educational attainment, adult height/BMI, age at menarche/menopause etc |
| Surveys | |
| AS_0_1 | ANTR survey 0.1 (general survey for new participants; 2008 - 2013) |
| AS_0_2 | ANTR survey 0.2 (general survey for new participants; 2015 -) |
| AS_1 | ANTR survey 1 (health, lifestyle, personality; 1991) |
| AS_2 | ANTR survey 1 (health, lifestyle, personality; 1993) |
| AS_3 | ANTR survey 3 (personality, lifestyle and health; 1995) |
| AS_4 | ANTR survey 4 (health, lifestyle, personality; 1997) |
| AS_5 | ANTR survey 5 (health, lifestyle, personality, substance use; 2000) |
| AS_6 | ANTR survey 6 (health, lifestyle, personality, exercise; 2002) |
| AS_7 | ANTR survey 7 (health, lifestyle, personality, borderline; 2004) |
| AS_8 | ANTR survey 8 (health, lifestyle, personality, substance abuse; 2009) |
| AS_9 | ANTR survey 9 (health, lifestyle, personality, anxiety and pain; 2011) |
| AS_10 | ANTR survey 10 (health, lifestyle, personality, substance use; 2012) |
| AS_11 | ANTR survey 11 (food preference; 2014) |
| AS_12 | ANTR survey 12 (BIONIC; major depressive disorder; 2015) |
| AS_13 | ANTR survey 13 (Flourishing, 2017) |
| AS_14 | ANTR survey 14 (health, lifestyle, personality, wellbeing; 2019) |
| AS_COV | COVID survey, ANTR and YNTR parents self-report |
| NS_MET | Harmonized exercise data (MET scores) from all surveys collected in one project |
| NS_TM05 | NTR Twin mothers survey (focus on familial twinning, pre-pregnancy information and maternal characteristics) |
| NS_TM05P | NTR Twin mothers survey, mothers reporting on their children |
| YS_1 | YNTR survey age 1 (maternal report; focus on conception, pregnancy, birth and health characteristics of their twins) |
| YS_2 | YNTR survey age 2 (parental report; focus on motor development, growth data, breastfeeding and handedness. From 2008 well-being and temperament were included) |
| YS_3M | YNTR survey age 3, rated by mothers (focus on behavioural and emotional behaviour (CBCL), health and growth. From 2009 well-being, leisure and sport activities, and life events of their parents were included) |
| YS_3V | YNTR survey age 3, rated by fathers (focus on behavioural and emotional behaviour (CBCL), health and growth. From 2009 well-being, leisure and sport activities, and life events of their parents were included) |
| YS_5 | YNTR survey age 5 (parental report; focus on behavioural and emotional behaviour (Short version of Devereux and from 2015 the CBQ), child care and school, growth, toilet training, asthma and eczema and fine motor coordination) |
| YS_7M | YNTR survey age 7, rated by mothers (focus on behavioural and emotional behaviour (CBCL and Conners), health and growth, school, physical activity and leisure time) |
| YS_7V | YNTR survey age 7, rated by fathers (focus on behavioural and emotional behaviour (CBCL and Conners), health and growth, school, physical activity and leisure time) |
| YS_10M | YNTR survey age 9/10, rated by mothers (focus on behavioural and emotional behaviour (CBCL and Conners), health and growth, school, physical activity and leisure time) |
| YS_10V | YNTR survey age 9/10, rated by fathers (focus on behavioural and emotional behaviour (CBCL and Conners), health and growth, school, physical activity and leisure time) |
| YS_12M | YNTR survey age 12, rated by mothers (focus on behavioural and emotional behaviour (CBCL and Conners), health and growth, school, physical activity and leisure time. From 2008 items well-being and parenting are included) |
| YS_12V | YNTR survey age 12, rated by fathers (focus on behavioural and emotional behaviour (CBCL and Conners), health and growth, school, physical activity and leisure time. From 2008 items well-being and parenting are included) |
| YS_CITO | Results of the CITO-test (a standardized test for educational achievement) that is administered in the final grade of elementary school (when children are 11 or 12 years old) |
| YS_COV | COVID survey, YNTR parents’ reports on their children (Brief Problem Monitor and wellbeing) |
| YS_DHBQP | Dutch Health and Behaviour Questionnaire, pilot (Self report twins and their siblings with focus on emotional and behavioural problems (YSR), subjective wellbeing, lifestyle, exercise behaviour, sedentary behaviour, and family functioning) |
| YS_DHBQ14 | Dutch Health and Behaviour Questionnaire, adolescents age 14 (Self report twins and their siblings with focus on emotional and behavioural problems (YSR), subjective wellbeing, lifestyle, exercise behaviour, sedentary behaviour, and family functioning) |
| YS_DHBQ16 | Dutch Health and Behaviour Questionnaire, adolescents age 16 (Self report twins and their siblings with focus on emotional and behavioural problems (YSR), personality (NEO), subjective wellbeing, lifestyle, exercise behaviour, sedentary behaviour, and family functioning) |
| YS_DHBQ18 | Dutch Health and Behaviour Questionnaire, adolescents age 18 (Self report twins and their siblings with focus on emotional and behavioural problems (YSR), subjective wellbeing, lifestyle, exercise behaviour, sedentary behaviour, and family functioning) |
| YS_DT | A short survey was sent to the parents of twin pairs discordant for gender of their teacher. Purpose was to obtain additional information and check discordance at the time of the teacher survey |
| YS_TRF5 | Teacher report of twins (age 5) (items on the teacher, class and school, functioning of the child, school performance, and on problem behaviour (TRF and Conners)) |
| YS_TRF7 | Teacher report of twins (age 7) and their siblings (items on the teacher, class and school, functioning of the child, school performance, and on problem behaviour (TRF and Conners)) |
| YS_TRF10 | Teacher report of twins (age 10) and their siblings (items on the teacher, class and school, functioning of the child, school performance, and on problem behaviour (TRF and Conners)) |
| YS_TRF12 | Teacher report of twins (age 12) and their siblings (items on the teacher, class and school, functioning of the child, school performance, and on problem behaviour (TRF and Conners)) |
| YS_TRIP | Survey data (focus on behavioural and emotional behaviour (CBCL), health and growth) collected in parents and teachers of triplets aged 1 to 12 |
| YS_VAL | YNTR 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) |
| Non-survey projects | |
| NB_BB1 | Biobank 1 – first NTR biobanking project |
| NC_IND | Indicators for availability of GWAS, methylation and metabolomics data |
| NE_HFSP | Human Frontier Science Program (HFSP) project, Daniëlle Posthuma |
| NE_NCHA | NTR neurocognitive testing (WebCNP) |
| NS_MET | Exercise MET scores from all surveys harmonized and collected in one project |
| YC_ACTION | Data collection of first-morning urine samples for metabolomics biomarker discovery and buccal-cell DNA samples for (epi)genetics in 9 years old children as part of the ACTION projects ("Aggression in Children: Unraveling gene-environment interplay to inform Treatment and InterventiON strategies" project (ACTION) |
| YC_ADHMRI | MRI study in MZ twin pairs concordant or discordant for attention problem scores |
| YC_BS1 | YNTR Brainscale 1 MRI experiment (First measurement (age 9) of a longitudinal study on individual differences in brain development (MRI) and cognition) |
| YC_BS2 | YNTR Brainscale 2 MRI experiment (Second measurement (age 12) of a longitudinal study on individual differences in brain development (MRI) and cognition) |
| YC_BS3 | YNTR Brainscale 3 MRI experiment (Third measurement (age 17) of a longitudinal study on individual differences in brain development (MRI) and cognition) |
| YC_DSC | DISC-IV interviews with mothers of twins with at least one twin with a high attention problem score, and collection of CBCL, SWAN and YSR surveys |
| YE_ATTEF1 | YNTR 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_ATTEF2 | YNTR 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_ATTEF3 | YNTR 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) |
| YE_COG10 | Project: ‘Cognitive abilities of 10-year-old twins’, the third measurement of a longitudinal study of the development of intelligence. The short version of the Revised Amsterdam Children Intelligence Test (RAKIT) was administered to a group of 10-year-old twins |
| YE_COG12 | Project: ‘Cognitive abilities of 12-year-old twins’, the fourth measurement of a longitudinal study on the development of intelligence and problem behaviour. Intelligence was measured by the Dutch version of the Wechsler Intelligence Scale for Children-Revised (WISC-R). Cortisol and testosterone levels were measured in saliva, pubertal development was measured with the Tanner self-report scales, and the Youth Self-Report (YSR) was collected |
| YE_COG18 | Project: ‘Physical, cognitive and behavioural development in late puberty’, the fifth measurement of a longitudinal study into the development of intelligence and problem behaviour. The test protocol consisted of a physical part, with cardiovascular functioning (assessed with the VU-AMS device), basic anthropometric measurements and the collection of saliva, DNA and fingerprints. The psychological part consisted of a series of cognitive tests, such as intelligence, stroop, Califormia verbal learning task, reading the mind in the eyes, Π inspection time task, n-back task and Coris block tapping task |
| YE_FITNSS | Adolescent exercise behaviour, Nienke Schutte |
* 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.