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Epidemiological Study (case-control study)Cellular telephone use and risk of acoustic neuroma. epidemiol. By: Christensen HC, Schüz J, Kosteljanetz M, Poulsen HS, Thomsen J, Johansen C
Published in: Am J Epidemiol 2004; 159 (3): 277 - 283 (  full article, PubMed Entry , Journal web site )Aim of study (according to author)
The possible association between cellular telephone use and the risk of acoustic neuroma was investigated in this Danish nationwide population-based case-control study.
Background/further details:
The study is part of the INTERPHONE project. Regular use of mobile phone was defined as more than one call per week for 6 months or more. Endpoint/type of risk estimation Estimate of incidence by odds ratio (OR)
Exposure - mobile phone, personal exposure
- type of exposure: personal
- assessment by interview (regular use, number of different cell phones, number of calls, use of handset and handsfree set)
- assessment by calculation (lifetime number of calls, lifetime number of hours of use)
groups of exposure:
| Reference group 1: | never used or less than once per week for six month | | group 2: | use regularly | | group 3: | time since first regular use never or rarely used < 1 year | | group 4: | time since first regular use 1-4 year | | group 5: | time since first regular use ≥ 5 year | | group 6: | time since first regular use 5-9 year | | group 7: | time since first regular use ≥ 10 year | | group 8: | first telephone operating system: no information | | group 9: | first telephone operating system: analogue | | group 10: | first telephone operating system: digital | | group 11: | lifetime cumulative number of calls ≤ 2975 | | group 12: | lifetime cumulative number of calls > 2975-11500 | | group 13: | lifetime cumulative number of calls > 11500 | | group 14: | lifetime cumulative hours of use ≤ 167.5 | | group 15: | lifetime cumulative hours of use > 167.5-654 | | group 16: | lifetime cumulative hours ofuse > 654 | | group 17: | cumulative use before diagnosis < 5 years | | group 18: | cumulative use before diagnosis ≥ 5 years (≤ 81.7 hours) | | group 19: | cumulative use before diagnosis ≥ 5 years (> 81.7 hours) |
Population
- case group
men and women, aged from 20 to 69 years
diagnosis: acoustic neuroma, primarily verified by magnetic resonance imaging
observation period: September 2000 - August 2002
study location: Denmark
source of data: Department of Otolaryngology-Head and Neck Surgery, Gentofte Hospital, University of Copenhagen, Denmark
exclusion criteria: deceased
- control group
selection: population-based
matching: sex, age, 1:2 (case:control)
Further parameters acquired by interview (hearing loss, tinnitus, education level)
Study size  | cases | controls |
|---|
| number eligible | 141 | 332 | | number contacted | 106 | 214 | | number participating | 106 | 212 |
Confounders: socioeconomic status
Statistical analysis using conditional logistic regression (adjusted for age, sex, residential area, education, marital status, use of hands-free device) Results/conclusion (according to author)
The results showed no evidence for an association between cellular telephone use and the risk of acoustic neuroma.
(Study character: epidemiological study, case-control study)
Study funded by - Danish Cancer Society
- European Union (EU)/European Commission
- International Union against Cancer (UICC; Union Internationale Contre le Cancer), Switzerland
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Glossary: acoustic neuroma, brain tumor, case-control study, cellular telephone, conditional logistic regression, Confounders, epidemiological, evidence, exposure, incidence, Interphone project, magnetic resonance imaging, matching, OR, population-based, risk, socioeconomic status, statistical, surgery, tinnitus |
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