On Tue, 11 Jan 2005 21:16:01 +0000, Prometheus
wrote:

...... in fact give the large proportion of the
population using such devices the stats would indicate some tumours in
less than ten years. Where are they?

Firstly, you have to ask yourself what is meant by 'ten years of use'.

Does it mean

- owning one for ten tears?
- having it switched on for ten years?
- using it for x hours a day for ten years?

The meaning of 'ten years' hasn't been made clear so far, at least on
this ng.

Then you need to take into account of the mechanics of tumour
initiation and development. There are thought to be five or six events
in the initiation and growth of a tumour to the stage where it can be
clinically diagnosed. Only one of these is associated with the
causative factor, which will have its own rate of effectiveness, and
so will each of the remaining steps.

Unless the statistics have been very carefully researched and
manipulated, and they may well have been, the numbers reported should
be treated with some caution....
--
from
Aero Spike