Table 2.

OR and 95% CI for lymphoma (all subtypes combined) and B-cell lymphomas in relation to dose and probability of exposure to external (A) and internal (B) ionizing radiation

(A) external radiation and (B) interal radiation	All lymphomas (N = 2319)			B-cell lymphomas (N = 1907)
	cases/controls	OR	95%CI	cases/controls	OR	95%CI
(A)
Unexposed	2095/2164	1.0	–	1730/2164	1.0	–
Ever exposed	224 /255	0.9	0.73–1.08	177/255	0.9	0.75–1.14
Average probability
Possible	199/228	0.9	0.73–1.08	156/228	0.9	0.74–1.15
Probable/definite	25/27	0.9	0.53–1.60	21/27	0.9	0.52–1.69
Average dose
1–2.5 mSv	103/121	0,8	0.62–1.08	85/121	0.9	0.65–1.16
≥ 2.6 mSv	121/134	1.0	0.74–1.24	92/134	1.0	0.74–1.30
≥ 2.6 mSv, probable/ definite exposure	16/13	1.3	0.60–2.64	12/13	1.2	0.53–2.60
Duration of exposure
≤ 11 years	116/131	0.9	0.68–1.15	85/131	0.9	0.68–1.21
≥ 12 years	108/124	0.9	0.68–1.17	92/124	0.9	0.71–1.25
Cumulative exposure
1.75–15.39 mSv-years	119/126	0.9	0.72–1.21	90/126	1.0	0.72–1.27
>  15.4 mSv-years	105/129	0.9	0.65–1.11	87/129	0.9	0.68–1.19
Probable/definite exposure
≥ 15.4 mSv-years	16/16	1.0	0.51–2.06	13/16	1.0	0.48–2.12
	All lymphomas (N = 2186)			B-cell lymphomas (N = 1700)
	cases/controls	OR	95%CI	cases/controls	OR	95%CI
(B)
Unexposed	2149/2164	1.0	–	1669/2164	1.0	–
Ever exposed	37/54	0.7	0.43–1.02	31/54	0.7	0.45–1.12
Average probability
Possible	13/22	0.6	0.28–1.12	11/22	0.6	0.31–1.33
Probable/definite	24/32	0.7	0.39–1.11	20/32	0.8	0.43–1.34
Average intensity
1–2.5 mSv	35/30	1.2	0.70–1.90	29/30	1.1	0.65–1.85
> 2.5 mSv	2/24	0.1	0.02–0.31	2/24	0.1	0.03–0.50
Duration of exposure
≤ 8 years	24/27	0.9	0.49–1.50	19/27	0.9	0.50–1.65
≥ 9 years	13/27	0.5	0.24–0.91	12/27	0.5	0.26–1.04
Cumulative exposure
≤ 30 mSv-years	21/25	0.8	0.45–1.46	18/25	0.9	0.50–1.71
> 30 mSv-years	16/29	0.5	0.29–1.00	13/29	0.5	0.27–1.03