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.

Subject age
  • 6.0 - 7.0 years
Time span From 2017-08-30 to 2018-09-28
Geographic location NL
Marinus van IJzendoorn
Leiden University, Erasmus University Rotterdam, University of Cambridge
Eveline Crone
Leiden University, Erasmus University Rotterdam
Marian Bakermans-Kranenburg
Leiden University, Vrije Universiteit Amsterdam
Rutger Engels
Leiden University, Erasmus University Rotterdam
Annemieke Witte
Vrije Universiteit Amsterdam
Bianca Langhout-van den Bulk
Erasmus University Rotterdam
Brigitte van den Berghe
Debby van Hees
Ilse de Visser
Lianne van Setten
Vrije Universiteit Amsterdam
Lieuwke Zwerver
Sanne de Vet
Leiden University
Saskia Euser
Funding information
Netherlands Organization for Scientific Research
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