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Table 1 Demographic Characteristics and Breast Cancer History of Female Kaiser Permanente Members Aged 40–65 in Marin County and East/Central Contra Costa County, California

From: Differences in reproductive risk factors for breast cancer in middle-aged women in Marin County, California and a sociodemographically similar area of Northern California

 

Marin

East/Central Contra Costa

 
 

Base No.

Percent (95% CI)

Base No.

Percent (95% CI)

p-value

Age

426

 

363

 

p < .053

   40 – 45 years

 

20.0 (15.9 – 24.1)

 

22.8 (18.3 – 27.4)

 

   46 – 50 years

 

20.1 (16.4 – 23.9)

 

23.7 (19.3 – 28.2)

 

   51 – 55 years

 

23.8 (19.8 – 27.8)

 

23.1 (18.7 – 27.6)

 

   56 – 60 years

 

20.3 (16.4 – 24.2)

 

17.1 (13.1 – 21.1)

 

   61 – 65 years

 

15.8 (12.4 – 19.1)

 

13.2 (10.2 – 16.2)

 

Race/Ethnicity

423

 

361

 

p = .007

   Caucasian

 

88.3 (85.2 – 91.4)

 

84.3 (80.5 – 88.1)

 

   African American

 

1.2 (0.1 – 2.2)

 

0.9 (<0.1 – 1.7)

 

   Hispanic

 

4.9 (2.8 – 7.0)

 

3.7 (1.7 – 5.6)

 

   Asian

 

4.2 (2.2 – 6.1)

 

10.8 (7.6 – 14.1)

 

   Other

 

1.4 (0.3 – 2.5)

 

0.3 (<0.1 – 0.8)

 

Ashkenazi Jewish heritage

416

12.8 (9.6 – 16.0)

357

7.1 (4.4 – 9.8)

p = .012

Household income

405

 

345

 

p = .14

   ≤ $35, 000

 

11.6 (8.4 – 14.7)

 

6.3 (3.8 – 8.9)

 

   > $35,000 to $50,000

 

10.2 (7.3 – 13.1)

 

9.9 (6.8 – 13.2)

 

   > $50,000 to $80,000

 

26.0 (21.7 – 30.3)

 

27.2 (22.5 – 32.0)

 

   > $80,000 to $100,000

 

17.6 (13.8 – 21.4)

 

17.2 (13.1 – 21.2)

 

   > $100,000

 

34.6 (29.9 – 39.3)

 

39.1 (33.9 – 44.5)

 

Education level

425

 

363

 

p = .47

   ≤High school grad

 

6.4 (4.1 – 8.7)

 

6.1 (3.6 – 8.5)

 

   Some college/tech school

 

36.4 (31.8 – 41.0)

 

36.7 (31.7 – 41.8)

 

   College graduate

 

30.2 (25.8 – 34.7)

 

34.5 (29.6 – 39.5)

 

   Graduate degree

 

25.6 (21.4 – 29.8)

 

22.7 (18.2 – 27.1)

 

History of breast cancer

425

5.0 (2.9 – 7.0)

363

4.6 (2.4 – 6.8)

p = .77

First degree relatives with history of breast cancer

426

 

363

  

   Daughter

 

1.1 (0 – 2.3)

 

0.6 (0 – 1.4)

p = .61

   Mother

 

13.7 (10.2 – 17.3)

 

11.4 (7.9 – 14.9)

p = .44

   Sister

 

3.6 (1.7 – 5.6)

 

4.4 (2.1 – 6.8)

p = .56

   ≥ 1 first degree female relative

 

14.8 (11.4 – 18.2)

 

13.6 (10.0 – 17.2)

p = .43

≥1 biopsy to check for cancer

425

21.8 (17.9 – 25.7)

363

17.2 (13.3 – 21.2)

p = .12