Results of case–case analyses of glioma and meningioma by time since start of use of mobile phones and cumulative call time comparing cases* originating in the region of the brain within the 3 dB exposure volume (∼16% of brain volume receiving 50% of the total absorbed energy) to cases† originating in other areas of the brain‡
| Glioma | Meningioma | |||||
| Centre within most exposed area* | Centre outside most exposed area† | OR (95% CI) | Centre within most exposed area* | Centre outside most exposed area† | OR (95% CI) | |
| Regular user | ||||||
| Never regular user | 14 | 178 | 1.00 | 66 | 221 | |
| Ever regular user | 30 | 334 | 1.35 (0.64 to 2.87) | 69 | 316 | 0.74 (0.49 to 1.11) |
| Time since start of use (years) | ||||||
| Never regular user | 14 | 178 | 1.00 | 66 | 221 | 1.00 |
| 1–4 | 12 | 133 | 1.37 (0.59 to 3.19) | 38 | 179 | 0.67 (0.41 to 1.07) |
| 5–9 | 7 | 147 | 0.72 (0.27 to 1.90) | 22 | 112 | 0.75 (0.42 to 1.34) |
| 10+ | 11 | 54 | 2.80 (1.13 to 6.94) | 9 | 25 | 1.34 (0.55 to 3.25) |
| Cumulative call time without hands-free devices (h) | ||||||
| Non-regular | 14 | 178 | 1.00 | 66 | 221 | 1.00 |
| <39 | 6 | 65 | 1.19 (0.40 to 3.51) | 16 | 97 | 0.55 (0.29 to 1.02) |
| 39– | 4 | 67 | 0.93 (0.27 to 3.14) | 21 | 78 | 0.93 (0.51 to 1.68) |
| 220– | 5 | 68 | 1.38 (0.42 to 4.53) | 9 | 52 | 0.52 (0.23 to 1.14) |
| 520– | 10 | 66 | 2.55 (0.94 to 6.91) | 10 | 52 | 0.67 (0.30 to 1.48) |
| 1147+ | 5 | 68 | 0.99 (0.30 to 3.27) | 13 | 37 | 1.41 (0.66 to 3.02) |
↵* Treated as ‘cases’.
↵† Treated as ‘controls’.
↵‡ Quintiles of cumulative call time among ‘controls’ (glioma cases with tumour centre outside the most exposed area). Centre is as estimated by a neuroradiologist when available or as estimated by computer algorithm otherwise. Unconditional logistic regression analyses were done, stratified on age, sex and region and adjusted for education and timing of interview.