• measure Urinary osmolality

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION BB1_1 YC_ACTION BB1_2 YC_ACTION BB2 YC_ACTION - BB3
     
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    Urinary osmolality was measured with a density test (specific gravity) using the Atago refractometer PAL-10S BLT/A+W (Atago, Tokyo, Japan). The refractive index is a ratio of the velocity of light in air to the velocity of light in solution, which is directly proportional to the number of dissolved solids in urine.
    Created October 17, 2024 • Updated October 20, 2024

  • measure Buccal swab

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION BB1_1 YC_ACTION BB1_2 YC_ACTION BB2 YC_ACTION - BB3 YC_BS1 YC_BS2 YC_BS3 YC_DSC YE_FITNSS YE_ATTEF1 YE_ATTEF2 YE_ATTEF3 YC_ADHMRI YE_COG18
     
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    Buccal swabs are collections of buccal cell scrapings obtained by rubbing buds along the inside of the mouth.
    Created October 17, 2024 • Updated October 20, 2024

  • measure Stroop color-word task

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Behavioral/cognitive task
    Available measurements:
    Young Netherlands Twin Register  YC_BS1 YC_BS2 YE_ATTEF2 YC_ADHMRI YE_COG18
     
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    The Stroop color-word task consists of pairs of conflicting word and color stimuli, both being inherent aspects of the same symbols, presented simultaneously, for example a name of one color printed in the ink of another color. The difference in time for reading the words printed in colors and the same words printed in black is the measure of the...
    Created October 17, 2024 • Updated October 20, 2024

  • measure LC-MS amines

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION BB1_1 YC_ACTION BB1_2 YC_ACTION BB2 YC_ACTION - BB3
     
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    Liquid chromatography mass spectrometry (LC-MS) platform targeting amines.
    Created October 17, 2024 • Updated October 20, 2024

  • measure Neuropeptides

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION BB1_1 YC_ACTION BB1_2 YC_ACTION BB2 YC_ACTION - BB3
     
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    Neuropeptides, including Substance P, Beta-endorphin, Dynorphin A, neurotensin, and Leu-enkaphalin, were measured with traditional enzymatic tests, such as Enzyme-Linked Immunosorbent Assays (ELISA).
    Created October 17, 2024 • Updated October 20, 2024

  • measure Genotyping (array)

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION BB1_1 YC_ACTION BB1_2 YC_ACTION BB2 YC_ACTION - BB3 YC_BS1 YC_BS2 YC_BS3 YC_DSC YE_FITNSS YC_ADHMRI YE_COG18
     
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    Assessment of single nucleotide polymorphisms (SNPs) as obtained through genotyping arrays.
    Created October 17, 2024 • Updated October 20, 2024

  • measure Verbal Fluency Test

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Behavioral/cognitive task
    Available measurements:
    Young Netherlands Twin Register  YC_BS2 YE_COG18
     
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    The Verbal Fluency Test assesses how many words that belong to the same predetermined category participants can produce in a given time (usually 60 seconds). This category can be semantic, specified objects such as animals or fruits, or phonological, words beginning with a specified letter such as p.
    Created October 17, 2024 • Updated October 20, 2024

  • measure Eriksen flanker task

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Behavioral/cognitive task
    Available measurements:
    Young Netherlands Twin Register  YC_BS1 YE_ATTEF2 YC_ADHMRI
     
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    The Eriksen Flanker task is a response inhibition test used to assess the ability to suppress responses that are inappropriate in a particular context. During the task, participants are presented with a central target stimulus (e.g., letter, arrow) and are asked to identify the identity or direction of the central stimulus, while ignoring surrounding...
    Created October 17, 2024 • Updated October 20, 2024

  • measure Spatial N-back Task

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Behavioral/cognitive task
    Available measurements:
    Young Netherlands Twin Register  YC_BS1 YC_BS2 YE_COG18
     
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    The Spatial N-back Task assesses visuospatial working memory. In the task, participants are instructed to remember and respond to the location of a stimulus on the screen throughout the task, either directly following the stimulus, or with a delay of one or more stimuli.
    Created October 17, 2024 • Updated October 20, 2024

  • measure LC-MS steroid hormones

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION BB2 YC_ACTION - BB3 YC_BS1
     
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    Liquid chromatography mass spectrometry (LC-MS) platform targeting steroid hormones.
    Created October 17, 2024 • Updated October 20, 2024

  • measure Raven's Progressive Matrices Test (RPM)

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Behavioral/cognitive task
    Available measurements:
    Young Netherlands Twin Register  YC_BS1 YC_BS2 YE_ATTEF3
     
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    Raven's Progressive Matrices (often referred to simply as Raven's Matrices or RPM) is a non-verbal test used to measure general intelligence and abstract reasoning. It is one of the most common tests administered to both groups and individuals ranging from 5-years-olds to the elderly. It consists of 60 multiple choice questions, listed in order of...
    Created October 17, 2024 • Updated October 20, 2024

  • measure GC-MS organic acids

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION BB1_1 YC_ACTION BB1_2 YC_ACTION BB2 YC_ACTION - BB3
     
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    Gas chromatography mass spectrometry (GC-MS) platform targeting organic acids.
    Created October 17, 2024 • Updated October 20, 2024

  • measure Saliva sample

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_BS1 YC_BS2 YC_BS3 YE_ATTEF2 YE_COG12 YE_COG18
     
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    Saliva was collected using a cotton swab or a collection device, such as a tube or container (passive drool).
    Created October 17, 2024 • Updated October 20, 2024

  • measure Steroid hormones

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_BS1 YC_BS2 YC_BS3 YE_ATTEF2 YE_COG12 YE_COG18
     
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    Steroid hormones, for instance Testosterone, Estrogen, Dehydroepiandrosterone (DHEA), and Cortisol, measured with traditional enzymatic tests, such as Enzyme-Linked Immunosorbent Assays (ELISA).
    Created October 17, 2024 • Updated October 20, 2024

  • measure Functional Magnetic Resonance Imaging (fMRI)

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    MRI
    Available measurements:
    Young Netherlands Twin Register  YC_BS2 YC_BS3 YC_ADHMRI
     
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    Functional magnetic resonance imaging (MRI) is a non-invasive technique for examining brain activity. It captures ongoing functional connectivity patterns within the brain, either spontaneously (at rest), or during a specific task.
    Created October 17, 2024 • Updated October 20, 2024

  • measure Liver enzymes

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION BB1_1 YC_ACTION BB1_2 YC_ACTION BB2 YC_ACTION - BB3 YC_BS1 YC_BS2 YC_BS3
     
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    Liver enzymes, for instance Albumin, Jodide, Aspartaat Aminotransferase (ASAT), and Alanine Transaminase (ALAT), measured with traditional enzymatic tests, such as Enzyme-Linked Immunosorbent Assays (ELISA).
    Created October 17, 2024 • Updated October 20, 2024

  • measure Peptide hormones

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION BB1_1 YC_ACTION BB1_2 YC_BS1 YC_BS2 YC_BS3
     
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    years
    Peptide hormones, for instance Adrenocorticotropic Hormone (ACTH, pituitary hormone), Alpha-Melanocyte-Stimulating Hormone (α-MSH, Melanocortin), Luteinizing Hormone (LH), Cholecytokinin, and Follicle Stimulating Hormone (FSH), measured with traditional enzymatic tests, such as Enzyme-Linked Immunosorbent Assays (ELISA).
    Created October 17, 2024 • Updated October 20, 2024

  • measure One Minute Reading Task

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Behavioral/cognitive task
    Available measurements:
    Young Netherlands Twin Register  YS_7 YC_BS1 YC_BS2 YC_BS3
     
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    One subtest of the ‘one minute reading test’ was administered as a measure of technical reading performance, or oral reading fluency. It measures the accuracy and speed of decoding. Children were instructed to read out loud as many words as possible in 1 minute without making errors from a card containing 120 unrelated words.
    Created October 17, 2024 • Updated October 20, 2024

  • measure DNA methylation (array)

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_ACTION - BB3
     
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    years
    Assessment of DNA methylation as obtained through DNA methylation arrays.
    Created October 17, 2024 • Updated October 20, 2024

  • measure GC-MS steroid hormones

    Study:Netherlands Twin Register
    Mode of collection: MeasurementsAndTests    Biological sample/measurement
    Available measurements:
    Young Netherlands Twin Register  YC_BS1 YC_BS2 YC_BS3
     
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    30
    years
    Gas chromatography mass spectrometry (GC-MS) platform targeting steroid hormones.
    Created October 17, 2024 • Updated October 20, 2024
You can also access this registry using the API (see API Docs).