Table 4

Odds ratio (OR) and 95 % confidence interval (CI) for cumulative lifetime use in hours of analogue and digital cellular telephones, cordless telephones and any combination of the three phone types for malignant brain tumours [9].

First tertile (h)
 Second tertile (h)
 Third tertile (h)

Ca/Co
 OR
 95 % CI
 Ca/Co
 OR
 95 % CI
 Ca/Co
 OR
 95 % CI

Malignant








Analogue
 57/109
 1.4
 0.97–2.0
 41/89
 1.1
 0.7–1.7
 80/99
 1.9
 1.3–2.7
Digital
 133/283
 1.3
 1.03–1.7
 108/246
 1.1
 0.9–1.5
 161/247
 1.5
 1.1–1.9
Cordless
 107/264
 1.1
 0.8–1.4
 94/204
 1.2
 0.9–1.6
 149/233
 1.7
 1.3–2.3
Total, any combination
 170/405
 1.2
 0.9–1.5
 169/377
 1.2
 0.9–1.5
 244/390
 1.5
 1.2–1.9
Astrocytoma, grade I-II








Analogue
 5/109
 0.9
 0.3–2.4
 7/89
 1.4
 0.6–3.5
 7/99
 1.3
 0.5–3.3
Digital
 20/283
 1.6
 0.9–2.9
 12/246
 1.0
 0.5–2.0
 24/247
 1.6
 0.8–2.9
Cordless
 15/264
 1.2
 0.6–2.2
 13/204
 1.1
 0.5–2.2
 28/233
 1.9
 1.1–3.5
Total, any combination
 25/405
 1.4
 0.8–2.4
 22/377
 1.1
 0.6–2.0
 41/390
 1.7
 1.04–2.9
Astrocytoma, grade III-IV








Analogue
 34/109
 1.5
 0.99–2.4
 27/89
 1.3
 0.8–2.2
 54/99
 2.3
 1.5–3.5
Digital
 74/283
 1.4
 1.01–1.9
 71/246
 1.4
 1.02–2.0
 99/247
 1.8
 1.3–2.5
Cordless
 65/264
 1.2
 0.8–1.6
 50/204
 1.3
 0.9–1.9
 90/233
 2.1
 1.5–2.9
Total, any combination
 91/405
 1.1
 0.8–1.5
 104/377
 1.4
 1.03–1.8
 146/390
 1.8
 1.3–2.4
Other malignant








Analogue
 18/109
 1.5
 0.8–2.6
 7/89
 0.7
 0.3–1.7
 19/99
 1.6
 0.9–3.0
Digital
 39/283
 1.4
 0.9–2.1
 25/246
 0.9
 0.5–1.4
 38/247
 1.1
 0.7–1.8
Cordless
 27/264
 1.0
 0.6–1.6
 31/204
 1.3
 0.8–2.1
 31/233
 1.2
 0.8–1.9
Total, any combination
 54/405
 1.4
 0.9–2.0
 43/377
 1.1
 0.7–1.6
 57/390
 1.3
 0.9–1.9

Number of exposed cases (Ca) and controls (Co) are given. Unconditional logistic regression analysis adjusted for age, sex, socio-economic index and year of diagnosis was used. Tertiles were based on use among controls.

Trend, malignant: Analogue – p = 0.11, digital – p = 0.21, cordless – p = 0.01, total – p = 0.04.

Trend, astrocytoma, grade I-II: Analogue – p = 0.72, digital – p = 0.38, cordless – p = 0.16, total – p = 0.30.

Trend, astrocytoma, grade III-IV: Analogue – p = 0.10, digital – p = 0.26, cordless – p = 0.01, total – p = 0.01.

Trend, other malignant: Analogue – p = 0.21, digital – p = 0.23, cordless – p = 0.64, total – p = 0.50.

Analogue: First tertile – 1–43 h, second tertile – >43–165 h, third tertile – >165 h

Digital: First tertile – 1–30 h, second tertile – >30–149 h, third tertile – >149 h

Cordless: First tertile – 1–122 h, second tertile – >122–365 h, third tertile – >365 h

Total, any combination: First tertile – 1–91 h, second tertile – >91–410 h, third tertile – >410 h

Hardell et al. World Journal of Surgical Oncology 2006 4:74   doi:10.1186/1477-7819-4-74