The Swedish Adoption/Twin Study on Aging (SATSA) was designed to study the origins of individual differences in aging and the environmental and genetic factors that are involved.

Overview

Acronym

SATSA

Website

SATSA Website

Investigators
Contacts
Start Year

1984

Study Design

Study Design Cohort
General Information on Follow Up (profile, frequency)

SATSA was started with a survey in 1984, and five additional waves were conducted in 1987, 1990, 1993, 2003, and 2007. The questionnaire was initially sent to all twins from the Swedish Twin Registry who were separated at an early age and raised apart. There was also a control sample of twins who were raised together. Altogether, 2,019 individuals responded to the first questionnaire. The response rate for the first questionnaire sent out in 1984 was 70.7% (2018 of 2854).

There was also an in-person testing (IPT) component for pairs who were over 50 years of age and where both responded to the initial questionnaire. This subsample of 859 individuals participated in at least one of the seven waves of in-person testing between 1987 and 2007, which included a health examination, interviews, and tests on functional capacity, cognitive abilities, and memory.

Recruitment Target
  • Families
Number of Participants

2,019

Number of Participants with Biosamples

859

Access

Access to external researchers or third parties provided or foreseen.

Data (questionnaire-derived, measured...)

Biosamples

Marker Paper

Pedersen, N. L., McClearn, G. E., Plomin, R., Nesselroade, J. R., Berg, S., & DeFaire, U. (1991). The Swedish Adoption Twin Study of Aging: an update. Acta Genet Med Gemellol (Roma), 40(1), 7-20.

PUBMED 1950353

Supplementary Information

Also see (attached):

Finkel, D., & Pedersen, N. L. (2004). Processing Speed and Longitudinal Trajectories of Change for Cognitive Abilities: The Swedish Adoption/Twin Study of Aging. Aging, Neuropsychology, and Cognition, 11(2-3), 325-345. doi: 10.1080/13825580490511152

Documents

Study Timeline

Each colour in the timeline graph below represents a separate Study Population, while each segment in the graph represents a separate Data Collection Event. Clicking on a segment gives more detailed information on a Data Collection Event.

Population

SATSA population

The SATSA population consists of a base sample of a selected subset of twins reared apart (TRA) from the Swedish Twin Registry (STR), and a control sample of twins reared together (TRT) also from the STR matched on gender, age, and county of birth. Altogether, there are 2019 participants between 26 and 93 years of age at baseline in 1984. 

Selection Criteria

Twins
Country Sweden
Ethnic Origin Swedish
Other

Twins reared apart, and a control sample of twins reared together matched on gender, age and county of birth.

Supplementary Information

Born before 1959; there was no relevant selection criteria for minimum age. The minimum baseline age from the Satsa sample is 26 years

Sample Size

Number of Participants

2,019

Number of Participants with Biosamples

859

Supplementary Information about Number of Participants

Q1 red: 2018 participants

Q1 blue: 1736 participants

Q2: 1637 participants

Q3: 1496 participants

Q4: 1450 participants

Q5: 794 participants

Q6: 648 participants

IPT1: 645 participants

IPT2: 595 participants

IPT3: 569 participants

IPT4: 40 participants

IPT5: 541 participants

IPT6: 448 participants

IPT7: 379 participants

 

Data Collection Events

NameDescriptionStartEnd
Q1 Red and Q1 Blue

Postal Questionnaire that included items...

1984 (November)1985 (February)
IPT1

Twin pairs who were over 50 years of age and...

1986 (February)1988 (December)
Q2

Postal Questionnaire that included items...

1987 (November)1988 (February)
IPT2

Twin pairs who were over 50 years of age and...

1989 (February)1991 (December)
Q3

Postal Questionnaire that included items...

1990 (November)1991 (February)
IPT3

Twin pairs who were over 50 years of age and...

1992 (February)1994 (December)
Q4

Postal Questionnaire that included items...

1993 (November)1994 (February)
IPT4

Twin pairs who were over 50 years of age and...

1995 (March)1995 (May)
IPT5

Twin pairs who were over 50 years of age and...

1999 (February)2001 (December)
IPT6

Twin pairs who were over 50 years of age and...

2002 (February)2004 (December)
Q5

Postal Questionnaire that included items...

2004 (May)2005 (February)
IPT7

Twin pairs who were over 50 years of age and...

2005 (February)2007 (December)
Q6

Postal Questionnaire that included items...

2007 (November)2008 (February)
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Variable Classification