Table 2.

Odds Ratio and 95% confidence interval of invasive breast cancer by age bands and dioxin exposure categories

Dioxin exposure	Cases	Controls	OR* (95% CI†)
Women aged 20–59 years
Very low	41	225	1.0
Low	81	414	1.06 (0.72–1.56)
Intermediate	64	279	1.25 (0.82–1.89)
High	11	67	0.88 (0.43–1.79)
Women aged 60 years and over
Very low	50	228	1.0
Low	111	558	0.90 (0.63–1.29)
Intermediate	72	339	0.96 (0.66–1.41)
High	4	60	0.31 (0.08–0.89)

* odds ratio

^† confidence interval