Table 1

 Overall incidence rate ratios (95% confidence intervals) for all cancers, smoking related cancers, and tumours of central nervous system among mobile phone subscribers in Denmark, 1987-95, followed up to 31 December 2007, for men, women, and men with more than 12 years of education

Site of cancerMen*Women†Men with >12 years of education‡
CasesIncidence rate ratio§CasesIncidence rate ratio§CasesIncidence rate ratio§
All cancers¶
Non-subscribers107 8401130 918117 0631
Subscribers14 4620.96 (0.95 to 0.98)27951.02 (0.98 to 1.06)24021.02 (0.97 to 1.06)
Years of subscription:
 1-428550.96 (0.92 to 1.00)7171.02 (0.95 to 1.10)4821.06 (0.97 to 1.16)
 5-952910.93 (0.91 to 0.96)12031.03 (0.97 to 1.09)8901.00 (0.94 to 1.07)
 ≥1063160.99 (0.97 to 1.02)8751.00 (0.93 to 1.06)10301.01 (0.95 to 1.08)
 10-1240330.99 (0.96 to 1.02)7210.99 (0.92 to 1.07)6470.99 (0.91 to 1.07)
 ≥1322831.00 (0.96 to 1.04)1541.00 (0.85 to 1.17)3831.04 (0.94 to 1.16)
All smoking related sites**
Non-subscribers44 247133 175154491
Subscribers54220.93 (0.90 to 0.96)6851.06 (0.98 to 1.14)7311.01 (0.93 to 1.09)
Years of subscription:
 1-411180.93 (0.87 to 0.99)1851.17 (1.02 to 1.36)1521.04 (0.88 to 1.23)
 5-920410.93 (0.89 to 0.97)2921.06 (0.95 to 1.19)2851.05 (0.93 to 1.18)
 ≥1022630.93 (0.89 to 0.97)2080.97 (0.85 to 1.12)2940.95 (0.85 to 1.08)
 10-1214950.97 (0.92 to 1.02)1650.94 (0.80 to 1.09)1991.02 (0.88 to 1.17)
 ≥137680.87 (0.81 to 0.93)431.15 (0.85 to 1.55)950.85 (0.69 to 1.04)
Central nervous system††
Non-subscribers43971548618501
Subscribers7141.02 (0.94 to 1.10)1321.02 (0.86 to 1.22)1201.00 (0.83 to 1.22)
Years of subscription:
 1-41801.07 (0.92 to 1.24)340.97 (0.69 to 1.36)381.29 (0.92 to 1.79)
 5-92580.95 (0.83 to 1.08)581.05 (0.81 to 1.37)440.95 (0.70 to 1.29)
 ≥102761.06 (0.94 to 1.20)401.03 (0.75 to 1.40)380.86 (0.62 to 1.20)
 10-121871.08 (0.93 to 1.25)341.05 (0.75 to 1.47)240.82 (0.55 to 1.24)
 ≥13891.03 (0.83 to 1.27)60.91 (0.41 to 2.04)140.94 (0.55 to 1.60)

*Men: 18 829 804 person years for non-subscribers, 3 229 589 person years for subscribers (person years by years of subscription: 1-4=893 248, 5-9=1 284 238, ≥10=1 052 103, 10-12: 747 444, ≥13=304 659).

†Women: 21 304 186 person years for non-subscribers, 533 733 person years for subscribers (person years by years of subscription: 1-4=164 507, 5-9=225 864, ≥10=143 361, 10-12=121 529, ≥13=21 832).

‡Subgroup: 3 645 725 person years for non-subscribers, 503 162 person years for subscribers (person years by years of subscription: 1-4=145 818, 5-9=197 710, ≥10=159 634, 10-12=111 053, ≥13=48 582).

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

¶ICD-10 codes C00-D48.

**ICD-10 codes C09-16, C22, C25, C32-34, C39, C53, C64, C67, D09.0, D30.3, D41.4.

††ICD-10 codes C70-72, C75, D32-33, D35, D42, D44.