• wave T1

    Study:L-CID
    Parent cohort:LCID: Early Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 1 of the Early Childhood Cohort consisted of an online questionnaire and a home visit in which participants were observed while performing several tasks. Additionally, participants were asked to take measurements (including collecting physiological data) on their own for several days after the home visit
    Created March 28, 2023 Updated March 28, 2023
  • wave T1

    Study:L-CID
    Parent cohort:LCID: Middle Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 1 of the Middle Childhood Cohort consisted of an online questionnaire and a lab visit in which participants were observed while performing several tasks. During some of the tasks, brain structure- and activity was measured by means of (f)MRI. Additionally, physiological samples were taken (e.g., DNA samples). Participants were also asked to take...
    Created March 28, 2023 Updated March 28, 2023
  • wave T2

    Study:L-CID
    Parent cohort:LCID: Early Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 2 of the Early Childhood Cohort consisted of an online questionnaire and a lab visit in which participants were observed while performing several tasks. During some of the tasks, brain activity was measured by means of EEG. Additionally, physiological samples were taken (e.g., hair and DNA samples). Participants were also asked to take measurements...
    Created March 28, 2023 Updated March 28, 2023
  • wave T3

    Study:L-CID
    Parent cohort:LCID: Early Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 3 of the Early Childhood Cohort consisted of an online questionnaire and a lab visit in which participants were observed while performing several tasks. During some of the tasks, brain activity was measured by means of EEG. Additionally, physiological samples were taken (e.g., hair and DNA samples). Participants were also asked to take measurements...
    Created March 28, 2023 Updated March 28, 2023
  • wave T2

    Study:L-CID
    Parent cohort:LCID: Middle Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 2 of the Middle Childhood Cohort consisted of an online questionnaire and a home visit in which participants were observed by researchers while performing several tasks. Additionally, physiological samples were taken (e.g., hair samples). Participants were also asked to take measurements on their own at home for several days after the home visit....
    Created March 28, 2023 Updated March 28, 2023
  • wave T3

    Study:L-CID
    Parent cohort:LCID: Middle Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 3 of the Middle Childhood Cohort consisted of an online questionnaire and a lab visit in which participants were observed while performing several tasks. During some of the tasks, brain structure- and activity was measured by means of (f)MRI. Additionally, physiological samples were taken (e.g., hair and DNA samples). Participants were also asked to...
    Created March 28, 2023 Updated March 28, 2023
  • wave T4

    Study:L-CID
    Parent cohort:LCID: Early Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 4 of the Early Childhood Cohort consisted of an online questionnaire and a home visit in which participants were observed while performing several tasks. Additionally, physiological samples were taken (e.g., hair samples). Participants were also asked to take measurements on their own at home for several days after the home visit.
    Created March 28, 2023 Updated March 28, 2023
  • wave T4

    Study:L-CID
    Parent cohort:LCID: Middle Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 4 of the Middle Childhood Cohort consisted of an online questionnaire and a home visit in which participants were observed while performing several tasks. Additionally, physiological samples were taken (e.g., hair samples). Participants were also asked to take measurements on their own at home for several days after the home visit.
    Created March 28, 2023 Updated March 28, 2023
  • wave T5

    Study:L-CID
    Parent cohort:LCID: Early Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 5 of the Early Childhood Cohort consisted of an online questionnaire and a lab visit in which participants were observed while performing several tasks. During some of the tasks, brain structure- and activity was measured by means of (f)MRI. Participants were also asked to take measurements (including collecting physiological data) on their own at...
    Created March 28, 2023 Updated March 28, 2023
  • wave T6

    Study:L-CID
    Parent cohort:LCID: Early Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 6 of the Early Childhood Cohort consisted of regular home visits before the start of the covid-19 pandemic, and digital home visits during the Covid-19 pandemic. In both cases, participants were observed while they performed tasks and they filled out an online questionnaire. During the pandemic, however, some tasks were dropped. Physiological samples...
    Created March 28, 2023 Updated March 28, 2023
  • wave T5

    Study:L-CID
    Parent cohort:LCID: Middle Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 5 of the Middle Childhood Cohort consisted of regular home visits before the start of the Covid-19 pandemic, and digital home visits during the Covid-19 pandemic. In both cases, participants were observed while they performed tasks and they filled out an online questionnaire. Participants also took measurements on their own at home. During the...
    Created March 28, 2023 Updated March 28, 2023
  • wave T6 - Covid

    Study:L-CID
    Parent cohort:LCID: Early Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 6 - Covid of the Early Childhood Cohort consisted of an online questionnaire that assessed both physical- and mental health during the Covid-19 pandemic.
    Created March 28, 2023 Updated March 28, 2023
  • wave T5 - Covid

    Study:L-CID
    Parent cohort:LCID: Middle Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 5 - Covid of the Middle Childhood Cohort consisted of an online questionnaire that assessed both physical- and mental health during the Covid-19 pandemic.
    Created March 28, 2023 Updated March 28, 2023
  • wave T6

    Study:L-CID
    Parent cohort:LCID: Middle Childhood Cohort
    Publisher: Leiden University Leiden University Medical Center
    Wave 6 of the Middle Childhood Cohort consisted of a digital home visit because of the Covid-19 pandemic. Participants were observed while they performed tasks and they filled out an online questionnaire. Some tasks were dropped, however, because it was not possible to perform them during a digital visit. Participants also took measurements on their own...
    Created March 28, 2023 Updated March 28, 2023
You can also access this registry using the API (see API Docs).