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Table 3 Prevalence of breast cancer risk factors in non-Hispanic white women 35 to 74 years of age

From: Recent changes in breast cancer incidence and risk factor prevalence in San Francisco Bay area and California women: 1988 to 2004

Patient characteristics Population-based control series (1989–1999) California Health Interview Survey
  SFBA
(n = 1,168)
2001 2003
   SFBA Californiaa SFBA Californiaa
Education      
   Some high school or less 3.2 (2.2–4.2) 2.3 (1.2–3.3) 7.5 (6.7–8.3) 2.9 (1.5–4.4) 6.2 (5.4–7.0)
   High school graduate 20.7 (17.9–23.4) 18.1 (16.0–20.2) 23.3 (22.4–24.3) 15.4 (13.3–17.5) 23.8 (22.6–25.0)
   Some college 27.7 (24.5–30.9) 27.0 (24.6–29.3) 34.4 (33.3–35.5) 25.1 (22.6–27.7) 34.3 (33.1–35.6)
   College graduate or higher 46.7 (42.5–50.9) 52.7 (50.0–55.3) 34.8 (33.7–35.9) 56.5 (53.6–59.4) 35.6 (34.3–36.9)
   Missing 1.6     
Body mass index <25 in women <50 years 64.4 (56.6–72.1) 64.1 (60.4–67.7) 58.0 (56.2–59.7) 63.9 (59.7–68.1) 57.2 (55.1–59.3)
Body mass index ≥ 30 in women ≥ 50 years 20.9 (17.5–24.2) 21.7 (18.5–24.8) 21.5 (20.2–22.9) 21.1 (17.7–24.5) 22.9 (21.4–24.4)
History of breast cancer in mother, sister, or daughter 13.9 (11.6–16.1) b b b b
Ever had a breast biopsy that was not cancer 11.7 (9.8–13.5) b b b b
Ever had radiation treatment to the chest 2.0 (1.2–2.7) b b b b
No vigorous/moderate physical activity in past 30 days b 19.8 (17.7–22.0) 23.4 (22.4–24.4) b b
Drank alcohol in past month b 71.3 (68.9–73.8) 61.3 (60.1–62.4) 69.8 (67.0–72.7) 61.0 (59.7–62.3)
   2+ drinks per dayc   27.6 23.6 28.0 25.9
Age at menarche <12 years 21.0 (18.2–23.8) 18.5 (16.4–20.6) 19.4 (18.5–20.4) b b
Age at first live birth ≥ 30 years 20.7 (17.8–23.7) 20.4 (18.3–22.5) 13.4 (12.6–14.2) b b
Number of live births      
   0 25.0 (21.9–28.1) 25.3 (23.2–27.4) 17.3 (16.5–18.2) b b
   1–2 48.2 (43.9–52.6) 51.4 (48.7–54.0) 48.0 (46.8–49.2)   
   ≥3 26.7 (23.8–29.7) 23.3 (21.0–25.6) 34.7 (33.6–35.8)   
Hormone therapy use      
   Never 53.7 (48.8–58.5) b b b b
   <5 years 21.2 (18.6–23.8)     
   ≥5 years 22.8 (20.3–25.3)     
   Missing 2.3     
Ever took hormone supplements for menopause symptoms b b b 29.8 (26.7–33.0) 34.5 (32.9–36.0)
Currently takes hormone supplements for menopause symptoms b 34.9 (32.1–37.7) 37.0 (35.8–38.2) 16.7 (14.2–19.1) 21.6 (20.4–22.7)
   Among women without a hysterectomyd   20.4 18.7 4.9 5.2
Mammogram screening history      
   2 years or less b 72.9 (70.5–75.2) 70.4 (69.3–71.5) 71.0 (68.3–73.7) 71.6 (70.3–72.8)
   More than 2 years ago   12.1 (10.4–13.8) 13.7 (12.9–14.5) 12.9 (10.9–14.9) 13.4 (12.5–14.3)
   Never had a mammogram   15.1 (13.1–17.0) 15.9 (15.0–16.8) 16.1 (13.8–18.3) 15.0 (14.0–16.1)
  1. aExcluding the SFBA. bNot available in the population-based control series or AskCHIS. cCalculated by dividing the number of women drinking 2+ drinks per day in the past 30 days by the total number of women (that is, the number of women who did and did not drink alcohol in the past 30 days). dCalculated by dividing the number of women who did not have a hysterectomy and reported using hormone supplements by the total number of women (that is, the number of women who did and did not take hormone supplements for menopause symptoms). SFBA, San Francisco Bay area.