June 2014
Beginner to intermediate
368 pages
15h 45m
English
Content preview from Epidemiology of Electromagnetic Fields
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239Brain Tumors and Mobile PhoneUse: The Ecological Approach
Indicators of changes in mobile phone use over time typically are based on surrogate
measures such as number of subscribers. This is not synonomous with number of users
and does not indicate level or duration of use, even at the population level. If individuals
used mobile phones less in earlier years (in terms of minutes or hours per day), it is con-
ceivable that observations for longer latency intervals are characterized by lighter levels of
use in the earlier years. However, changes over time in mobile telephone technology also
should be considered (see Chapter19). Early mobile ...
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