Mobile phone use
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inadequate: 2-5 min/day
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significant: 16-32 min/day
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Latency time
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<5% cases with latency ≥10 y
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>18% cases with latency ≥10 y
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Cordless phone users
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considered unexposed
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considered exposed
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Ipsilateral tumour latency
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≥10 y for only 2% cases
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≥10 y for >16% cases
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Head tumours identified
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only gliomas, meningiomas, neuromas, parotid tumours
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also other head tumours types
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Deceased cases
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not included
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included: proxy interviews
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Interviews
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not blind
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always double blind
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Type of interviews
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face-to-face
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mailed questionnaires
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Time of interviews
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cases: during hospitalisation
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cases: after hospitalisation
|
|
controls: at home
|
controls: at home
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Exposure assessment
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non blind interview
|
blind questionnaire
|
Data processing
|
not stated (not blind?)
|
Blind
|
Laterality attribution bias
|
present
|
Absent
|
Delayed interviews
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for controls compared to cases
|
not delayed
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Participation
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reduced up to 40%
|
always near to 90%
|
Selection
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exposed controls prevail
|
no selection bias
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Documentation
|
positive data ignored
|
no documentation bias
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Funding
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co-funded by MP Companies
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funded only by Public Bodies
|