Table 2. Standardized hospitalisation ratios (SHRs) and 95% confidence intervals (CIs) for diseases of the central nervous system among 420 095 subscribers to cellular telephones in Denmark, 1982–1995, followed up through 31 December 2003.

Disease	Latency (years)*	Observed	Expected	SHR	CI
Alzheimer disease	1	1	5.4	0.2	0.0–1.0
	1–4	25	33.1	0.8	0.5–1.1
	5–9	50	63.4	0.8	0.6–1.0
	≥10	5	13.1	0.4	0.1–0.9
	Total	81	114.9	0.7	0.6–0.9
Vascular dementia	1	2	4.3	0.5	0.1–1.7
	1–4	19	26.8	0.7	0.4–1.1
	5–9	34	52.9	0.6	0.4–0.9
	≥10	13	11.8	1.1	0.6–1.9
	Total	68	95.7	0.7	0.5–0.9
Other dementia	1	21	40.1	0.5	0.3–0.8
	1–4	131	198.7	0.7	0.5–0.8
	5–9	198	257.5	0.8	0.7–0.9
	≥10	33	54.8	0.6	0.4–0.9
	Total	383	551.1	0.7	0.6–0.8
Parkinson disease	1	10	21.4	0.5	0.2–0.9
	1–4	82	106.0	0.8	0.6–1.0
	5–9	110	136.1	0.8	0.7–1.0
	≥10	35	31.6	1.1	0.8–1.5
	Total	237	295.1	0.8	0.7–0.9
Amyotrophic lateral sclerosis	1	11	8.1	1.4	0.7–2.4
	1–4	42	37.2	1.1	0.8–1.5
	5–9	44	44.5	1.0	0.7–1.3
	≥10	7	10.1	0.7	0.3–1.4
	Total	104	99.9	1.0	0.9–1.3
Multiple sclerosis	1	61	51.3	1.2	0.9–1.5
	1–4	222	217.4	1.0	0.9–1.2
	5–9	220	211.1	1.0	0.9–1.2
	≥10	25	29.4	0.9	0.6–1.3
	Total	528	509.3	1.0	0.9–1.1
Epilepsy (men)	1	201	249.9	0.8	0.7–0.9
	1–4	752	1015.4	0.7	0.7–0.8
	5–9	716	979.4	0.7	0.7–0.8
	≥10	98	176.0	0.6	0.5–0.7
	Total	1767	2420.6	0.7	0.7–0.7
Epilepsy (women)	1	41	37.1	1.1	0.8–1.5
	1–4	156	145.2	1.1	0.9–1.3
	5–9	135	129.0	1.0	0.9–1.2
	≥10	5	7.1	0.7	0.2–1.6
	Total	337	318.4	1.1	0.9–1.2

^*Time since first subscription to a cellular telephone.