Population-based study to identify risk factors for Alzheimer's disease, disability, and other age-associated health conditions.

Overview

Acronym

CHAP

Investigators
Contacts
Start Year

1993

End Year

2011

Study Design

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

The CHAP study included in-person interviews that were conducted in the participants' homes in approximately three-year cycles, with each subsequent cycle starting immediately after completion of the previous one, for a total of 5 follow-up.

Recruitment Target
  • Individuals
Number of Participants

10,801

Number of Participants with Biological Samples

8,000

Access

Yes
No
Not Applicable
Don't Know
Possible Access to Data

Possible Access to Biosamples

Other

Marker Paper

Bienias JL, Beckett LA, Bennett DA, Wilson RS, Evans DA. Design of the Chicago Health and Aging Project (CHAP). 2003; 5(5): 349-55.

PUBMED 14646025

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

CHAP - Urban population of older adults from the south-west side of Chicago

The original CHAP study population was selected from three adjacent community areas (Morgan Park, Washington Heights and Beverly) on the south-west side of Chicago. In 1993, the study began with a complete census of the study area, and all residents aged 65 and older were invited to participate. As of the third interview cycle, CHAP began to enroll newly aged participants; that is, community residents that had turned 65 years since the beginning of the study. As of the fourth cycle, CHAP also began to enroll residents from a neighboring community area, Mount Greenwood, to achieve a more even racial balance in its study population.

Sources of Recruitment

Supplementary Information

Census of the study area.

Selection Criteria

Age Minimum age 65
Country United States of America
Territory

Chicago.

Ethnic Origin Whites and Blacks

Sample Size

Number of Participants

10,801

Number of Participants with Biological Samples

8,000

Supplementary Information about Number of Participants

The "original cohort", enrolled between 1993 and 1997, included 6,158 participants. In 2000, CHAP began to enroll additional participants from the study community who had turned 65 since inception of the study as “successive age cohorts.”

Data Collection Events

NameDescriptionStartEnd
CHAP - Baseline

CHAP data collection consisted of in-person...

1993 (January)1997 (May)
CHAP - Follow-up 1

CHAP data collection consisted of in-person...

1997 (June)2000 (February)
CHAP - Follow-up 2

CHAP data collection consisted of in-person...

2000 (March)2003 (January)
CHAP - Telephone interviews

As of the third cycle, CHAP started to add...

2000 (March)2011 (December)
CHAP - Follow-up 3

CHAP data collection consisted of in-person...

2003 (February)2006 (April)
CHAP - Follow-up 4

CHAP data collection consisted of in-person...

2006 (May)2009 (January)
CHAP - Follow-up 5

CHAP data collection consisted of in-person...

2009 (March)2011 (December)
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Variables classifications