National Institute of Environmental Health Sciences   —  National Institutes of Health   —  U.S. Department of Health and Human Services

The Sister Study

Demographic Characteristics

The percentages for each characteristic may not add up to 100 due to rounding. Those missing data or for whom a category was not applicable were excluded from the total (N = 50,884) for calculating percentages. 

Age (in years) of Participant
at Baseline Enrollment
Number of Participants Percentage

35-44

45-54

55-64

65 or older

6,578

17,520

17,912

8,874

13%

34%

35%

17%

 

Self-Reported Race/Ethnicity Number of Participants Percentage

White, non-Hispanic

Black, non-Hispanic

Hispanic

Other

Missing

42,558

4,462

2,515

1,334

15

84%

9%

5%

3%

--

 

Highest Education Level Attained Number of Participants Percentage

High school or less

Some college, no degree

Associate/technical degree

Bachelor's degree

Graduate degree

Missing

7,805

9,957

7,224

13,714

12,172

12

15%

20%

14%

27%

24%

--

 

Income Number of Participants Percentage

Less than $20,000

$20,000 - $49,999

$50,000 - $99,999

$100,000 - $200,000

More than $200,000

Missing

2,296

10,284

19,907

12,868

3,534

1,995

5%

21%

41%

26%

7%

--


back to top

Passive Cohort

The percentages for each characteristic may not add up to 100 due to rounding. Those missing data or for whom a category was not applicable were excluded from the total (N = 3,066) for calculating percentages. Data approximates final passive follow-up data.

Age (in years) of Participant
at Baseline Enrollment
Number of Participants Percentage

35-44

45-54

55-64

65 or older

624

1,263

880

299

20%

41%

29%

10%

 

Self-Reported Race/Ethnicity Number of Participants Percentage

White, non-Hispanic

Black, non-Hispanic

Hispanic

Other

Missing

1,939

723

293

106

5

63%

24%

10%

4%

--

 

Highest Education Level Attained Number of Participants Percentage

High school or less

Some college, no degree

Associate/technical degree

Bachelor's degree

Graduate degree

Missing

614

751

531

672

490

8

20%

25%

17%

22%

16%

--

 

Income Number of Participants Percentage

Less than $20,000

$20,000 - $49,999

$50,000 - $99,999

$100,000 - $200,000

More than $200,000

Missing

247

775

1,082

625

174

163

9%

27%

37%

22%

6%

--


back to top


About NIH/NIEHS    |   Accessibility    |    Contact Us    |    Disclaimersexit disclaimer    |    Freedom of Information Actexit disclaimer    |    Office of Inspector General (OIG)exit disclaimer    |    Privacy Policy    |    Vulnerability Disclosure Policyexit disclaimer    |    Website Archiveexit disclaimer