Table 1. Adjusted rate ratios for Multiple Sclerosis among private subscribers to mobile phones in Denmark, 1987–1995, followed up through 2004.

		Women			Men			Total
		Personyears	MS	IRR 95% CI	Personyears	MS	IRR 95% CI	Personyears	MS	IRR 95% CI
Until diagnosis
Non subscribers		27 517 890	3 531	Reference	25 309 803	1 517	Reference	52 827 693	5 048	Reference
Subscription holders		572 177	102	1.02 (0.83–1.24)	3.490.862	304	1.11 (0.98–1.26)	4 063 040	406	1.06 (0.96–1.18)
Years of subscription
<1	60 044		13	1.61 (0.93–2.79)	344 413	18	0.91 (0.57–1.46)	404 457	31	1.09 (0.76–1.56)
1–3	176 918		26	1.00 (0.68–1.48)	1 012 944	70	1.12 (0.87–1.44)	1 189 862	96	1.05 (0.85–1.29)
4–6	171 243		28	0.84 (0.58–1.22)	975 610	100	1.21 (0.98–1.50)	1 146 853	128	1.08 (0.90–1.29)
7–9	139 559		26	0.91 (0.61–1.34)	840 374	91	1.11 (0.89–1.39)	979 932	117	1.04 (0.86–1.26)
10–12	20 847		7	1.87 (0.89–3.94)	234 295	18	0.88 (0.55–1.41)	255 142	25	1.04 (0.70–1.54)
13+	3 567		2	3.43 (0.86–13.72)	83 227	7	1.02 (0.48–2.16)	86 794	9	1.26 (0.65–2.43)
10+	24 414		9	2.08 (1.08–4.01)	317 522	25	0.92 (0.61–1.37)	341 936	34	1.09 (0.77–1.53)
Until 1st symptom
Non subscribers		21 929 622	3 336	Reference	20 599 730	1 485	Reference	42.529.353	4 821	Reference
Subscription holders		351 972	57	0.94 (0.72–1.23)	2 261 285	195	1.10 (0.94–1.28)	2 613 258	252	1.05 (0.92–1.19)
Years of subscription
<1		60 012	7	0.70 (0.33–1.48)	344 332	33	1.33 (0.94–1.90)	404 344	40	1.11 (0.81–1.52)
1–3		176 836	30	0.98 (0.69–1.41)	1 012 638	84	1.06 (0.84–1.33)	1 189 474	114	1.02 (0.84–1.24)
4–6		104 217	17	0.93 (0.58–1.51)	705 980	65	1.09 (0.84–1.41)	810 197	82	1.06 (0.84–1.32)
7–9		8 703	1	0.73 (0.10–5.16)	138 245	11	1.06 (0.59–1.93)	146 948	12	1.05 (0.60–1.86)
10+		2 204	2	6.75 (1.69–27.05)	60 091	2	0.50 (0.13–2.02)	62 295	4	0.99 (0.37–2.65)