Tokyo Twin Cohort Project (ToTCoP)
ToTCoP investigates human growth and development in a Japanese twin population. The study recruited twins aged from 0 to 2 years from the 252 municipalities in the Tokyo Metropolis and neighbouring Kanagawa, Chiba, and Saitama prefectures. Participants were initially recruited in 2004 through invitation letters and the Basic Resident Register (BRR), focusing on twins residing in these regions. At baseline, 1,619 pairs of twins from 1,601 families were recruited. Follow-ups were conducted annually to track the growth and development of the participants until 2023. Participants of this study are now tracked through the Keio Twin Registry as a sister study hosted by the Keio Twin Research Center (KoTReC).
Study design
Cohort - twin
Number of participants at first data collection
3,238 (participants)
Age at first data collection
0 - 2 years (participants)
Participant year of birth
2004 - 2006 (participants)
Participant sex
All
Representative sample at baseline?
No
Sample features
Country
Year of first data collection
2004
Primary Institutions
Keio Twin Research Center (KoTReC)
Keio University (慶應義塾大学)
Profile paper DOI
Funders
Japan Science and Technology Agency (科学技術振興機構, JST)
Ministry of Education, Culture, Sports, Science and Technology (MEXT/Monbusho)
Ongoing?
No
Data types collected
- Computer, paper or task testing (e.g. cognitive testing, theory of mind doll task, attention computer tasks)
- Interview – face-to-face
- Physical environment assessment (e.g. pollution, mould)
- Physical or biological assessment (e.g. blood, saliva, gait, grip strength, anthropometry)
- Self-report questionnaire – unspecified
- None
- Electroencephalography (EEG)
- Near-infrared spectroscopy (NIRS)
- Other government data
Engagement
Keywords
Consortia and dataset groups
