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Cohort 1

Cohort 1 represents the sample of children who were 6 years old in 2006. The study’s goal is to accompany these children until the age of 21. This allows us to explore the entire development from school entry until the beginning of adulthood. It is of utmost importance to continue interviewing as many of the initially interviewed children as possible to keep a representative sample of the Swiss population.

Cohort 1, Wave 1

Survey period: January until April 2006
Interviewees: Children, their principal caregivers and teachers
Survey instruments used:
Children Personal interviews with a laptop at their home (CAPI)
Principal caregivers Personal interviews with a laptop at their home (CAPI) and paper and pencil questionnaires
Teachers Paper and pencil questionnaires
Sample size: N=1273

Cohort 1, Wave 2

Survey period: March until June 2007
Interviewees: Principal caregivers
Survey instruments used:
Principal caregivers Telephone interview (CATI) and paper and pencil questionnaires
Sample size: N=1192

Cohort 1, Wave 2: Intermediary Survey

Survey period: May until July 2008
Interviewees: Principal caregivers (only those whose children did not yet attend primary school at the time of the second wave in 2007)
Survey instruments used:
Principal caregivers Telephone interview (CATI) and paper and pencil questionnaires
Sample size: N=128

 Cohort 1: Wave 3

Survey period: March until May 2009
Interviewees: Children, their principal caregivers and teachers
Survey instruments used:
Children Personal interviews with a laptop at their home (CAPI)
Principal caregivers Personal interviews with a laptop at their home (CAPI) and paper and pencil questionnaires
Teachers Paper and pencil questionnaires
Sample size: N=1118

 Cohort 1, Wave 4: Intermediary Survey

Survey period: January until April 2011
Interviewees: Children, their principal caregivers and teachers (only those who are expected to make the transition to lower secondary-school early)
Survey instruments used:
Children Personal interviews with a laptop at their home (CAPI) and paper and pencil questionnaires
Principal caregivers Personal interviews with a laptop at their home (CAPI) and paper and pencil questionnaires
Teachers Paper and pencil questionnaires
Sample size: N=143

 Cohort 1, Wave 4

Survey period: January until May 2012
Interviewees: Children, their principal caregivers and teachers
Survey instruments used:
Children Personal interviews with a laptop at their home (CAPI) and paper and pencil questionnaires
Principal caregivers Personal interviews with a laptop at their home (CAPI) and paper and pencil questionnaires
Teachers Paper and pencil questionnaires
Sample size: N=1038

Cohort 1, Wave 5

Survey period: February to March 2013
Interviewees: Children and their principal caregivers
Survey instruments used:
Children Telephone interview (CATI)
Principal caregivers Paper and pencil questionnaires
Sample size: N=950

Cohort 1, Wave 5: Intermediary Survey

Survey period: February to March 2014
Interviewees: Children and their principal caregivers
Survey instruments used:
Children Telephone interview (CATI)
Principal caregivers Paper and pencil questionnaires
Sample size: N=149

Cohort 1, Wave 6

Survey period: January until May 2015
Interviewees: Children, their principal caregivers and teachers
Survey instruments used:
Children Personal interviews with a laptop at their home (CAPI) and paper and pencil questionnaires
Principal caregivers Personal interviews with a laptop at their home (CAPI) and paper and pencil questionnaires
Teachers Paper and pencil questionnaires
Sample size: N=930

Cohort 1, Wave 7

Survey period: May to June 2017
Interviewees: Children
Survey instruments used:
Children Telephone interview (CATI)
Sample size: N=826