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Table 3 Multivariatea comparisons of residence history of women with breast cancer and controls in Marin County, California, 1997–99

From: Risk factors for breast cancer in a population with high incidence rates

   All women Women aged 50 years and over Women under 50 years of age
Variable (Total N) Cases N (%) (285) Controls N (%) (286) Multivariate OR (95% CI) Cases N (%) (201) Controls N (%) (201) Multivariate OR (95% CI) Cases N (%) (84) Controls N (%) (85) Multivariate OR (95% CI)
Lived in Northeast before age 21
   Never 189 (66.3) 205 (71.7) 1.0 137 (68.2) 145 (72.1) 1.0 52 (61.9) 60 (70.6) 1.0
   Ever 96 (33.7) 81 (28.3) 1.3 (0.88–2.0) 64 (31.8) 56 (27.9) 1.2 (0.69–1.9) 32 (38.1) 25 (29.4) 3.2 (1.3–7.9)
Lived in Great Lakes region before age 21
   Never 211 (74.0) 222 (77.6) 1.0 148 (73.6) 146 (72.6) 1.0 63 (75.0) 76 (89.4) 1.0
   Ever 74 (26.0) 64 (22.4) 1.1 (0.72–1.7) 53 (26.4) 55 (27.4) 0.79 (0.47–1.3) 21 (25.0) 9 (10.6) 4.6 (1.4–14.7)
Born in the Northeast
   No 215 (75.4) 235 (82.2) 1.0 155 (77.1) 164 (81.6) 1.0 60 (71.4) 71 (83.5) 1.0
   Yes 70 (24.6) 51 (17.8) 1.5 (0.94–2.4) 46 (22.9) 37 (18.4) 1.1 (0.61–2.0) 24 (28.6) 14 (16.5) 6.2 (2.2–17.8)
Born in the Great Lakes region
   No 236 (82.8) 244 (85.3) 1.0 166 (82.6) 164 (81.6) 1.0 70 (83.3) 80 (94.1) 1.0
   Yes 49 (17.2) 42 (14.7) 1.2 (0.73–2.1) 35 (17.4) 37 (18.4) 0.89 (0.48–1.6) 14 (16.7) 5 (5.9) 4.3 (1.0–18.3)
Years lived in Marin County before age 21
   0 years 238 (83.5) 236 (82.5) 1.0 171 (85.1) 175 (87.1) 1.0 67 (79.8) 61 (71.8) 1.0
   ≤ 6.2 years 14 (4.9) 13 (4.5) 1.7 (0.72–4.0) 9 (4.5) 7 (3.5) 2.7 (0.85–8.5) 5 (6.0) 6 (7.1) 0.32 (0.06–1.7)
   6.2 years to 10.75 years 10 (3.5) 12 (4.2) 0.72 (0.27–1.9) 6 (3.0) 8 (4.0) 0.73 (0.21–2.5) 4 (4.8) 4 (4.7) 0.81 (0.12–5.5)
   >10.75 years to 16.6 years 6 (2.1) 11 (3.8) 0.69 (0.22–2.1) 5 (2.5) 6 (3.0) 1.2 (0.30–5.0) 1 (1.2) 5 (5.9) 0.09 (0.01–1.4)
   >16.6 years 17 (6.0) 14 (4.9) 1.3 (0.58–3.1) 10 (5.0) 5 (2.5) 2.2 (0.60–8.0) 7 (8.3) 9 (10.6) 1.1 (0.29–4.6)
   Mean ± SEM Mean ± SEM   Mean ± SEM Mean ± SEM   Mean ± SEM Mean ± SEM  
   1.9 ± 0.3 1.9 ± 0.3   1.7 ± 0.3 1.3 ± 0.3   2.3 ± 0.6 3.5 ± 0.7  
Lifetime years lived in Marin County
   2 months to 13 years 75 (26.3) 68 (23.8) 1.0 32 (15.9) 29 (14.4) 1.0 43 (51.2) 39 (45.9) 1.0
   >13 years to ≤24 years 75 (26.3) 72 (25.2) 0.78 (0.46–1.3) 49 (24.4) 48 (23.9) 0.71 (0.32–1.5) 26 (31.0) 24 (28.2) 0.88 (0.32–2.4)
   >24 years to ≤32 years 61 (21.4) 74 (25.9) 0.68 (0.38–1.2) 54 (26.9) 62 (30.8) 0.61 (0.29–1.3) 7 (8.3) 12 (14.1) 0.52 (0.14–2.0)
   >32 years to ≤60 years 74 (26.0) 72 (25.2) 0.78 (0.42–1.4) 66 (32.8) 62 (30.8) 0.77 (0.35–1.7) 8 (9.5) 10 (11.8) 1.2 (0.30–4.6)
   Mean ± SEM Mean ± SEM   Mean ± SEM Mean ± SEM   Mean ± SEM Mean ± SEM  
   24.2 ± 0.8 24.1 ± 0.8   27.7 ± 1.0 27.4 ± 0.9   15.9 ± 1.2 16.4 ± 1.3  
Lifetime years lived in other San Francisco Bay Area Countiesb
   ≥ 0 years to ≤ 6 years 161 (56.7) 147 (51.4) 1.0 111 (55.5) 111 (55.2) 1.0 50 (59.5) 36 (42.4) 1.0
   >6 years to ≤ 16 years 61 (21.5) 71 (24.8) 0.76 (0.47–1.2) 43 (21.5) 43 (21.4) 1.0 (0.57–1.9) 18 (21.4) 28 (32.9) 0.27 (0.10–0.73)
   >16 years to ≤55 years 62 (21.8) 68 (23.8) 0.84 (0.53–1.3) 46 (23.0) 47 (23.4) 1.0 (0.60–1.8) 16 (19.0) 21 (24.7) 0.30 (0.09–0.94)
   Mean ± SEM Mean ± SEM   Mean ± SEM Mean ± SEM   Mean ± SEM Mean ± SEM  
   8.8 ± 0.7 9.8 ± 0.7   9.4 ± 0.8 9.6 ± 0.9   7.4 ± 1.0 10.4 ± 1.2  
Age of first living in Marin County
   0–22 years 54 (18.9) 70 (24.5) 1.0 33 (16.4) 40 (19.9) 1.0 21 (25.0) 30 (35.3) 1.0
   23–28 years 83 (29.1) 68 (23.8) 1.5 (0.83–2.5) 63 (31.3) 53 (26.4) 1.2 (0.62–2.5) 20 (23.8) 15 (17.6) 2.3 (0.71–7.8)
   29–36 years 73 (25.6) 75 (26.2) 1.2 (0.69–2.1) 55 (27.4) 54 (26.9) 1.1 (0.54–2.2) 18 (21.4) 21 (24.7) 1.4 (0.48–4.4)
   37–68 years 75 (26.3) 73 (25.5) 1.3 (0.76–2.3) 50 (24.9) 54 (26.9) 1.1 (0.54–2.3) 25 (29.8) 19 (22.4) 1.3 (0.41–4.0)
   Mean ± SEM Mean ± SEM   Mean ± SEM Mean ± SEM   Mean ± SEM Mean ± SEM  
   29.2 ± 0.8 28.7 ± 0.8   29.8 ± 0.9 30.4 ± 0.9   27.6 ± 1.4 24.7 ± 1.5  
  1. CI, confidence interval; OR, odds ratio. Statistically significant results are shown in bold. aOdds ratios for each variable in this table are adjusted for age and the following variables as categorized in Table 2: family history of breast cancer, benign biopsy history, previous radiation treatment, age at menarche, menopausal status, reproductive history, oral contraceptive use, hormone replacement therapy, highest body mass index after age 21, number of mammograms 1990–94, socioeconomic status before age 21, highest degree, religion, alcohol use, and tobacco use. bOne case had missing information for this variable.