Twin Study of Child and Adolescent Development (TCHAD)

Sample details

The TCHAD is a longitudinal study of how genes and environments contribute to the development of health and behavioral problems from childhood to adulthood. The study includes 1,480 twin pairs born in Sweden who were followed since 1994, when the twins were 8 to 9 years old. The participants of the TCHAD study were twins born between May 1985 and December 1986. They were followed to the age of 26 years. The parents of the twins responded with questionnaires alongside the children.

Study design
Cohort, Cohort - twin

Number of participants at first data collection

2,960 (participants)

Age at first data collection

8 - 9 years (participants)

Participant year of birth

1985 - 1986 (participants)

Participant sex
All

Representative sample at baseline?
No

Sample features

Dizygotic and monozygotic twins

Dataset details

Country

Sweden

Year of first data collection

1994

Primary Institutions

Karolinska Institute (Karolinska Institutet, KI)

Links

ki.se/en/meb/twin-study-of-child-and-adolescent-development-tchad

ki.se/en/research/research-areas-centres-and-networks/research-centres/the-swedish-twin-registry/projects-based-on-twin-data

Profile paper DOI

doi.org/10.1375/twin.10.1.67

Funders

Swedish Research Council (Vetenskapsrådet)

Swedish Research Council for Health, Working Life and Welfare (Forskningsrådet för arbetsliv, hälsa och välfärd, FORTE)

Ongoing?
No

Data types collected

Quantitative data collection

Interview – phone
Physical or biological assessment (e.g. blood, saliva, gait, grip strength, anthropometry)
Secondary data
Self-report questionnaire – paper or computer assisted

Qualitative data collection