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Epidemiological Study (case-control study)

Use of mobile phones in Norway and risk of intracranial tumours. epidemiol.

By: Klaeboe L, Blaasaas KG, Tynes T
Published in: Eur J Cancer Prev 2007; 16 (2): 158 - 164 (PubMed | Journal website)

Aim of study (according to author)
A population-based case-control study was conducted in Norway to test the hypothesis that use of mobile phones increases the risk of gliomas, meningiomas and acoustic neuromas. This study is part of the INTERPHONE project.
Background/further details:
Regular use was defined as use of a cellular telephone at least once a week for 6 months or more.

Endpoint/type of risk estimation

Estimate of incidence by odds ratio (OR)

Exposure

groups of exposure:

Reference group 1:  no or irregular use 
group 2:  regular use 
group 3:  duration of regular use: < 2 years 
group 4:  duration of regular use: 2 - 5 years 
group 5:  duration of regular use: ≥ 6 years 
group 6:  time since first regular use: < 2 years 
group 7:  time since first regular use: 2 - 5 years 
group 8:  time since first regular use: ≥ 6 years 
group 9:  cumulative use: < 17 hours 
group 10:  cumulative use: 17 - 424 hours 
group 11:  cumulative use: ≥ 425 hours 
group 12:  cumulative use adjusted for handsfree: < 17 hours 
group 13:  cumulative use adjusted for handsfree: 17 - 424 hours 
group 14:  cumulative use adjusted for handsfree: ≥ 425 hours 
group 15:  cumulative number of calls: < 400 
group 16:  cumulative number of calls: 400 - 6999 
group 17:  cumulative number of calls: ≥ 7000 
group 18:  digital phones, regular use 
group 19:  digital phones, time since first regular use: < 2 years 
group 20:  digital phones, time since first regular use: 2 - 5 years 
group 21:  digital phones, time since first regular use: ≥ 6 years 
group 22:  analog phones, regular use 
group 23:  analog phones, time since first regular use: < 6 years 
group 24:  analog phones, time since first regular use: ≥ 6 years 
Reference group 25:  ipsilateral, never or rare use or use or use on opposite side to tumour 
group 26:  ipsilateral, regular use 
group 27:  ipsilateral, duration of regular use: < 2 years 
group 28:  ipsilateral, duration of regular use: 2 - 5 years 
group 29:  ipsilateral, duration of regular use: ≥ 6 years 
group 30:  ipsilateral, time since first regular use: < 2 years 
group 31:  ipsilateral, time since first regular use: 2 - 5 years 
group 32:  ipsilateral, time since first regular use: ≥ 6 years 
Reference group 33:  contralateral, never or rare use or use on same side as tumour 
group 34:  contralateral, regular use 
group 35:  contralateral, duration of regular use: < 2 years 
group 36:  contralateral, duration of regular use: 2 - 5 years 
group 37:  contralateral, duration of regular use: ≥ 6 years 
group 38:  contralateral, time since first regular use: < 2 years 
group 39:  contralateral, time since first regular use: 2 - 5 years 
group 40:  contralateral, time since first regular use: ≥ 6 years 

Population


Study size i cases  controls 
number participating 541358
rate of participating 74%69%

Statistical analysis using logistic regression (adjusted for age, sex, residential area, education)

Results/conclusion (according to author)
No association was found between the use of mobile phones and the risk of gliomas, meningiomas or acoustic neuroma. The laterality of mobile phone use did not correlate with the location of the tumours.

Limitations (according to author): The observation time was too short to detect long-term effects of mobile phone use.

(Study character: epidemiological study, case-control study)

Study funded by

Related articles i
Glossary: acoustic neuroma, analog, brain tumor, case-control study, cumulative, digital, epidemiological, exposure, gliomas, hypothesis, incidence, Interphone project, laterality, logistic regression, matching, meningiomas, mobile communication, mobile phone, OR, population-based, risk, statistical, tumours
Exposure: mobile communication system, analog mobile phone, digital mobile phone, personal exposure

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