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The Sister Study

Lifestyle & family history

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. 

Lifestyle Characteristics

Body Mass Index (BMI)
of Participant
Number of Participants Percentage

Underweight (less than 18.5)

Normal weight (18.5-24.9)

Overweight (25.0-29.9)

Obese (30.0 or more)

Missing

563

18,875

16,151

15,278

17

1%

37%

32%

30%

--

 

Smoking Status of Participant Number of Participants Percentage

Never smoked

Yes: past smoker

Yes: current smoker

Missing

28,552

18,141

4,175 

16

56%

36%

8%

--

 

Alcohol Intake of Participant Number of Participants Percentage

Never consumed alcohol

Yes: Former drinker

Current drinker: less than 1 drink per day

Current drinker: 1 drink per day

Current drinker: 1.1 to 1.9 drinks per day

Current drinker: 2 or more drinks per day

Missing

1,949

7,730

34,256

1,237

3,160

2,465

87

4%

15%

67%

2%

6%

5%

--

 

Family History of Breast Cancer

Participant Reports Mother Diagnosed with Breast Cancer Number of Participants Percentage

Yes

No

Missing

9,135

39,834

1,915

19%

81%

--

 

Participant Reports a Sister Diagnosed with Breast Cancer Number of Participants Percentage

1 sister with breast cancer

2 or more sisters with breast cancer

Missing

45,706

5,177

1

90%

10%

--


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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.

Lifestyle Characteristics

Smoking Status of Participant Number of Participants Percentage

Never smoked

Yes: former smoker

Yes: current regular smoker

Missing

1,595

968

499 

4

52%

32%

16%

--

 

Alcohol Intake of Participant Number of Participants Percentage

Never consumed alcohol

Yes: Former drinker

Current drinker

Missing

153

593

2,304

16

5%

19%

76%

--

 

Family History of Breast Cancer

Participant Reports a Sister Diagnosed with Breast Cancer Number of Participants Percentage

1 sister with breast cancer

2 or more sisters with breast cancer

Missing

2,739

325

2

89%

11%

--


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