Table 2.

Estimated Elevation in Brain Tumor Risk^a for Regular Mobile Phone Users With Information on Preferred Side of Use^b (n = 792), INTERPHONE Grid Data, 2000–2004

Model	Distance From Preferred Ear to Gravity Center of Tumor, mm
	0–55			55.01–75			75.01–95			95.01–115			≥115.01c
	No.d	${\hat{\mathbf{\alpha }}}_1$	95% CI	No.	${\stackrel{\mathbf{ˆ}}{\mathbf{\alpha }}}_{\mathbf{2}}$	95% CI	No.	${\stackrel{\mathbf{ˆ}}{\mathbf{\alpha }}}_{\mathbf{3}}$	95% CI	No.	${\stackrel{\mathbf{ˆ}}{\mathbf{\alpha }}}_{\mathbf{4}}$	95% CI	No.	$\stackrel{\mathbf{ˆ}}{\mathbf{\alpha }}$	95% CI
Standard	45	2.37	1.66, 4.56	159	1.75	1.38, 2.34	220	1.42	1.14, 1.81	166	1.10	1.00, 1.49	202	1.00	N/A
Highest SARe	25	2.62	1.70, 6.33	150	1.92	1.47, 2.60	210	1.38	1.11, 1.80	173	1.10	1.00, 1.45	234	1.00	N/A
Mixing wpref = 0.75 f	45	9.66	2.84, 39.3	159	3.50	1.96, 8.78	220	2.09	1.36, 3.76	166	1.28	1.00, 2.52	202	1.00	N/A

Abbreviations: CI, confidence interval; N/A, not applicable; SAR, specific absorption rate.

^a The $\hat{\mathrm{\alpha }}$ values represent the elevation in risk of observing a tumor within a given interval compared with the assumed baseline risk.

^b Side of the head preferred for mobile phone use.

^c Reference category ($\hat{\mathrm{\alpha }}$ = 1).

^d Number of tumors within a given interval.

^e The intervals were 0–40 mm, 40.01–60 mm, 60.01–80 mm, 80.01–100 mm, and ≥100.01 mm and measured the distance from the preferred ear to the point with the highest SAR.

^f In the model with the mixing proportion, 75% of phone calls were assigned to the preferred side of use and 25% to the nonpreferred side of use.