Association between Latitude and Breast Cancer Incidence in Mainland Australian Women
Table 2
Age-adjusted odds ratio of breast cancer relative to women at latitude ≤27°S within each IRSD and ARIA category.
Latitude (°S)
≤271
27–30
>30–33
>33–36
>36
OR
P
OR (95% CI)
P
OR (95% CI)
P
OR (95% CI)
P
OR (95% CI)
P
IRSD2 (quintiles)
1
1
—
1.9 (1.2–3.0)
0.007
2.1 (1.4–3.0)
<0.001
2.0 (1.5–2.8)
0.001
1.9 (1.3–2.7)
<0.001
2
1
—
1.2 (1.0–1.5)
0.103
2.2 (1.8–2.6)
<0.001
2.1 (1.7–2.4)
<0.001
1.9 (1.6–2.3)
<0.001
3
1
—
1.5 (1.2–1.8)
<0.001
2.5 (2.0–3.1)
<0.001
2.3 (1.9–2.8)
<0.001
2.3 (1.9–2.8)
<0.001
4
1
—
1.1 (1.0–1.3)
0.083
2.3 (2.0–2.6)
<0.001
2.1 (1.8–2.4)
<0.001
1.9 (1.6–2.1)
<0.001
5
1
—
1.1 (0.9–1.3)
0.328
2.3 (1.9–2.8)
<0.001
2.2 (1.9–2.6)
<0.001
2.1 (1.8–2.6)
<0.001
ARIA3
—
Major city
1
—
1.1 (0.9–1.3)
0.258
2.2 (1.9–2.6)
<0.001
2.1 (1.8–2.4)
<0.001
2.0 (1.7–2.3)
<0.001
Inner regional
1
—
1.6 (1.3–1.9)
<0.001
2.4 (2.1–2.8)
<0.001
2.3 (2.0–2.7)
<0.001
2.2 (1.9–2.5)
<0.001
Outer regional
1
—
1.7 (1.3–2.1)
<0.001
2.1 (1.7–2.6)
<0.001
2.1 (1.8–2.5)
<0.001
2.1 (1.7–2.6)
<0.001
Remote/very remote
1
—
1.1 (0.5–2.3)
0.823
2.0 (1.2–3.2)
0.007
2.2 (1.4–3.3)
<0.001
2.9 (1.4–6.0)
0.006
OR: odds ratio. CI: confidence interval. 1Reference category. 2IRSD: Index of Relative Socioeconomic Disadvantage. 3ARIA: Accessibility/Remoteness Index of Australia. P = significant at 95% CI.
