Tumour risk associated with use of cellular telephones or cordless desktop telephones

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].

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

ISSN: 1477-7819