Table 4

Distribution of age and ZIP code for breast cancer cases, 1985–-2002

% Diagnosed Breast Cancer

Breast Cancer Rates (per 100,000)

Odds Ratio

95% CI^a

P-value

Age (years)

15–44

12.47

39

1

45–64

39.81

227

5.81^b

1.65, 1.86

<0.0001

65–74

24.46

469

11.94^b

2.37, 2.60

<0.0001

≥75

23.26

459

2.45^b

2.34, 2.57

<0.0001

ZIP code

48883

1.30

90

1

48415

2.35

123

1.28

-0.11, 0.60

0.1699

48457

1.76

108

1.13

-0.25, 0.50

0.5163

48601

11.29

112

1.25

-0.08, 0.52

0.1526

48602

8.93

133

1.39^b

0.03, 0.64

0.0309

48603

13.79

171

1.34

-0.01, 0.58

0.0579

48604

3.17

133

1.34

-0.04, 0.63

0.0877

48611

1.46

126

1.22

-0.19, 0.59

0.3160

48616

1.63

110

1.01

-0.37, 0.39

0.9657

48618

1.41

139

1.35

-0.10, 0.69

0.1407

48623

2.32

105

1.15

-0.22, 0.49

0.4546

48626

1.30

112

1.13

-0.28, 0.52

0.5451

48640

12.08

184

1.86^b

0.32, 0.92

<.0001

48642

3.82

60

0.63^b

-0.80, -0.14

0.0047

48650

1.89

127

1.2

-0.19, 0.55

0.3430

48655

1.65

126

1.26

-0.15, 0.61

0.2408

48657

2.17

137

1.35

-0.06, 0.66

0.0982

48706

11.40

138

1.2

-0.12, 0.47

0.2509

48708

7.67

131

1.25

-0.08, 0.53

0.1539

48732

3.58

145

1.22

-0.13, 0.53

0.2356

48734

2.80

183

1.3

-0.09, 0.60

0.1438

48880

2.22

171

1.88^b

0.27, 0.98

0.0006

Note: ZIP codes 48640 and 48602 are located in the city of Midland and the confluence area of the Tittabawassee and Saginaw Rivers, respectively. If a simple Bonferroni's adjustment is applied (0.05/21), p < 0.0024 can be used to judge significance. This criterion makes ZIP codes 48640 and 48880 more significant than others.

^a CI, confidence interval.

^b statistically significant at the 5% significance level.

Dai and Oyana Environmental Health 2008 7:49   doi:10.1186/1476-069X-7-49