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Table 4 Associations between land use in recharge areas for drinking water wells and breast cancer.

From: Breast cancer risk and drinking water contaminated by wastewater: a case control study

Fraction of Recharge Area in Specified Land Use Cases Controls Adjusted OR (95% CI)a Adjusted OR (95% CI)b
Residential
0 to < .5 252 262 1.0 (reference) 1.0 (reference)
.5 to < 1 243 195 1.3 (1.0–1.7) 1.1 (0.8–1.5)
1 to < 1.5 157 136 1.2 (0.9–1.6) 0.9 (0.7–1.3)
1.5 to < 2 125 106 1.3 (0.9–1.7) 1.0 (0.7–1.4)
≥ 2 47 46 1.1 (0.7–1.7) 0.8 (0.5–1.4)
Commercial
0 to < .5 671 611 1.0 (reference) 1.0 (reference)
.5 to < 1 58 61 0.9 (0.6–1.4) 0.8 (0.6–1.3)
1 to < 1.5 17 16 1.1 (0.5–2.2) 1.2 (0.6–2.4)
1.5 to < 2 19 11 1.7 (0.8–3.7) 1.7 (0.8–3.6)
2 to < 2.5 10 5 2.1 (0.7–6.4) 2.0 (0.7–6.2)
2.5 to < 3 25 22 1.2 (0.7–2.2) 1.1 (0.6–2.0)
≥ 3 24 19 1.2 (0.6–2.2) 1.0 (0.5–1.9)
Pesticide application area
0 to < .5 303 309 1.0 (reference) 1.0 (reference)
.5 to < 1 240 187 1.3 (1.0–1.7) 1.1 (0.8–1.5)
1 to < 1.5 238 211 1.2 (0.9–1.6) 0.9 (0.7–1.3)
≥ 1.5 43 38 1.2 (0.8–2.0) 1.0 (0.6–1.6)
Totalc
0 to < .5 86 112 1.0 (reference) 1.0 (reference)
.5 to < 1 120 101 1.6 (1.1–2.4) 1.4 (0.9–2.2)
1 to < 1.5 75 72 1.4 (0.9–2.2) 1.2 (0.8–2.0)
1.5 to < 2 95 84 1.6 (1.0–2.4) 1.3 (0.8–2.2)
2 to < 2.5 196 155 1.8 (1.2–2.6) 1.4 (0.8–2.4)
2.5 to < 3 51 48 1.4 (0.9–2.4) 1.1 (0.6–2.1)
3 to < 3.5 109 97 1.6 (1.1–2.4) 1.2 (0.7–2.2)
≥ 3.5 92 76 1.7 (1.1–2.7) 1.4 (0.8–2.4)
  1. a Adjusted for diagnosis/reference year, age at diagnosis/reference year, birth decade, study, vital status, previous breast cancer diagnosis, age at first birth, family history of breast cancer, and education.
  2. b Adjusted for variables in analysis [a] and years on Cape Cod and years on the Cape squared.
  3. c Residential plus pesticide use area plus commercial.