Table 2

 Incidence rate ratios (95% confidence intervals) for intracranial tumours of central nervous system categorised according to ICD-O morphology and topography codes among men and women with mobile phone subscriptions in Denmark, 1987-95, followed up to 31 December 2007

Tumour categoryMen*Women*
CasesIncidence rate ratio†CasesIncidence rate ratio†
Glioma‡
Non-subscribers1853114551
Subscribers3241.08 (0.96 to 1.22)320.98 (0.69 to 1.40)
Years of subscription:
 1-4851.20 (0.96 to 1.50)80.87 (0.43 to 1.75)
 5-91221.05 (0.87 to 1.26)141.02 (0.60 to 1.72)
 ≥101171.04 (0.85 to 1.26)101.04 (0.56 to 1.95)
 10-12801.06 (0.85 to 1.34)NA
 ≥13370.98 (0.70 to 1.36)NA
Meningioma§
Non-subscribers429112481
Subscribers500.78 (0.58 to 1.05)301.02 (0.71 to 1.47)
Years of subscription:
 1-4150.92 (0.55 to 1.56)91.08 (0.56 to 2.09)
 5-9140.56 (0.33 to 0.96)131.04 (0.60 to 1.79)
 ≥10210.90 (0.57 to 1.42)80.93 (0.46 to 1.87)
Other and unspecified¶
Non-subscribers968112971
Subscribers1621.12 (0.95 to 1.33)351.19 (0.85 to 1.67)
Years of subscription:
 1-4371.09 (0.78 to 1.53)70.95 (0.45 to 2.00)
 5-9601.08 (0.83 to 1.40)161.28 (0.78 to 2.09)
 ≥10651.19 (0.92 to 1.55)121.27 (0.72 to 2.25)

NA=not applicable (numbers too small for analyses).

*See table 1 for person years for men and women.

†Adjusted for age, calendar period, level of education, and disposable income.

‡ICD-O topography codes C71.0-71.9 and morphology codes 93803-94813.

§ICD-O topography codes C70 and morphology codes 93803-94813.

¶Pineal gland (C75.3) and other morphologies for C70 and C71.0-9.