Table 1 |
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Characteristics of cases and controls whose Cape Cod residences were served by public water supplies. |
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| Characteristic |
Cases (n = 824) No. (%) |
Controls (n = 745) No. (%) |
Adjusted OR (95% CI)a |
|
|
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| Family history of breast cancerb |
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| No |
620 (75) |
602 (81) |
1.0 (reference) |
| Yes |
204 (25) |
143 (19) |
1.4 (1.1 – 1.7) |
| Age at birth of first child |
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| Under 30 |
510 (62) |
530 (71) |
1.0 (reference) |
| Nulliparous, or 30+ |
314 (38) |
215 (29) |
1.6 (1.3 – 2.0) |
| Prior breast cancer diagnosis |
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| No |
761 (92) |
680 (91) |
1.0 (reference) |
| Yes |
63 (8) |
65 (9) |
0.8 (0.5 – 1.1) |
| Highest grade completed |
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| Less than high school graduate |
54 (7) |
75 (10) |
0.6 (0.4 – 0.9) |
| High school graduate |
280 (34) |
237 (32) |
1.0 (reference) |
| Some college/vocational |
249 (30) |
221 (30) |
1.0 (0.7 – 1.2) |
| College graduate |
140 (17) |
131 (18) |
0.9 (0.7 = 1.3) |
| Graduate study/degree |
101 (12) |
81 (11) |
1.1 (0.8 – 1.6) |
|
|
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a Adjusted for all other variables in the table and diagnosis/reference year, age at diagnosis/reference year, birth decade, study, and vital status b Breast cancer diagnosis in a mother, sister, or daughter. |
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Brody et al. Environmental Health: A Global Access Science Source 2006 5:28 doi:10.1186/1476-069X-5-28 |
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