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Table 5 Associations between land use in recharge areas for homogenous drinking water supplies 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 < .5 201 211 1.0 (reference) 1.0 (reference)
.5 to < 1 234 184 1.4 (1.0–1.9) 1.1 (0.8–1.6)
1 to < 1.5 139 122 1.2 (0.8–1.6) 0.9 (0.6–1.3)
1.5 to < 2 99 90 1.2 (0.8–1.7) 0.9 (0.6–1.4)
≥ 2 9 16 0.7 (0.3–1.6) 0.5 (0.2–1.2)
Commercial
0 to < .5 587 533 1.0 (reference) 1.0 (reference)
.5 to < 1 49 54 0.9 (0.6–1.4) 0.8 (0.5–1.3)
1 to < 1.5 12 8 1.6 (0.6–4.1) 1.7 (0.7–4.4)
1.5 to < 2 10 7 1.4 (0.5–3.9) 1.4 (0.5–3.7)
2 to < 2.5 7 3 2.6 (0.6–10.3) 2.3 (0.6–9.3)
2.5 to < 3 17 18 1.0 (0.5–2.0) 0.9 (0.4–1.8)
Pesticide application area
0 to < .5 234 243 1.0 (reference) 1.0 (reference)
.5 to < 1 178 140 1.3 (1.0–1.8) 1.2 (0.8–1.6)
1 to < 1.5 229 203 1.2 (0.9–1.6) 0.9 (0.7–1.4)
≥ 1.5 41 37 1.2 (0.7–2.0) 0.9 (0.5–1.6)
Totalc
0 to < .5 70 93 1.0 (reference) 1.0 (reference)
.5 to < 1 87 72 1.7 (1.1–2.6) 1.5 (0.9–2.4)
1 to < 1.5 69 64 1.5 (0.9–2.4) 1.3 (0.7–2.2)
1.5 to < 2 90 81 1.6 (1.0–2.6) 1.3 (0.7–2.3)
2 to < 2.5 187 149 1.9 (1.3–2.8) 1.4 (0.8–2.6)
2.5 to < 3 46 40 1.5 (0.9–2.6) 1.2 (0.6–2.3)
3 to < 3.5 98 87 1.7 (1.1–2.6) 1.2 (0.6–2.4)
≥ 3.5 35 37 1.4 (0.8–2.5) 1.0 (0.5–2.2)
  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.