Table 1.

Characteristics of Regular Mobile Telephone Users Who Provided Information on Preferred Side of Use^a (n = 792), INTERPHONE Grid Data, 2000–2004

	No.	%
Sex
Male	508	64.1
Female	284	35.9
Age, years
30–39	224	28.3
40–49	257	32.4
50–59	311	39.3
Tumor grade
I	16	2.0
II	315	39.8
III	114	14.4
IV	303	38.3
Missing data	44	5.6
Tumor size, no. of voxels
1–10	240	30.3
11–20	201	25.4
21–30	138	17.4
31–187	213	26.9
Time since start of use, years
1–3.99	273	34.5
4–6.99	253	31.9
7–9.99	145	19.3
10–22.8	121	15.3
Cumulative phone use, hours
0–29.9	207	26.1
30–149.9	191	24.1
150–649.9	196	24.7
650–211,000	198	25.0
Cumulative no. of calls
0–999	235	29.7
1,000–2,999	145	18.3
3,000–11,900	209	26.4
12,000–506,000	203	25.6

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