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