Table 3. Thyroid cancer risk according to dose before age 15 years and to work at nuclear sites.

	Total population (229 cases and 373 controls)			Excluding unifocal micro-carcinomas, cancers of unknown size and their controls (141 cases/231 controls)
Exposure	Cases/controls	OR (95% CI)a	P-value for trend	Cases/controls	OR (95% CI)a	P-value for trend
Thyroid dose before age 15 years
<1 mGy	156/250	1b		93/149	1b
1–9.9 mGy	61/111	1.0 (0.5–1.9)	0.04	39/74	1.1 (0.5–2.6)	0.02
10–19.9 mGy	7/9	3.3 (0.8–14)		5/6	6.2 (0.9–41)
20–39 mGy	5/3	5.7 (0.8–45)		4/2	11.6 (1.0–132)
Work at nuclear sites during tests
No	219/361	1b		132/222	1b
Yes	10/12	1.0 (0.3–3.5)	0.9	9/9	1.5 (0.4–5.8)	0.7

Abbreviations: OR=odds ratio, CI=confidence interval.

^aAdjusted on ethnic group, level of education, body surface area, family history of thyroid cancer and number of pregnancies for women.

^bReference category.