Table 3. Risk of death among Multiple Sclerosis patients with private subscriptions to mobile phones in Denmark. 1987–1995, followed up through 2004.

	Women			Men			Total
	Person years	Deaths	MRR 95% CI	Person years	Deaths	MRR 95% CI	Person years	Deaths	MRR 95% CI
Non subscribers	39 575	400	Reference	18 333	306	Reference	57 908	706	Reference
Subscription holders	1 339	16	1.27 (0.77–2.09)	3 595	45	0.79 (0.58–1.09)	4 934	61	0.91 (0.70–1.19)
Years of subscription after MS-diagnosis
<1	190	2	1.35 (0.33–5.45)	509	2	0.40 (0.10–1.64)	700	4	0.59 (0.22–1.59)
1–3	487	4	1.06 (0.39–2.85)	1 305	7	0.47 (0.22–1.00)	1 792	11	0.58 (0.32–1.06)
4–6	382	2	0.57 (0.14–2.00)	934	14	0.91 (0.53–1.57)	1 317	16	0.90 (0.54–1.48)
7–9	246	8	2.44 (1.20–4.98)	645	16	1.06 (0.63–1.78)	891	24	1.41 (0.93–2.15)
10+	33	0	–	202	6	0 93 (0.41–2.12)	235	6	0.95 (0.42–2.15)