Relatie tussen problemen van kinderen en mobiele telefoons
maandag, 19 mei 2008 - Categorie: Onderzoeken
Er blijkt een relatie te bestaan tussen gedragsproblemen van jonge kinderen en het gebruik van de mobiele telefoon door hun moeder tijdens de zwangerschap.
Warning: Using a mobile phone while pregnant can seriously damage your baby
Study of 13,000 children exposes link between use of handsets and
later behavioural problems
By Geoffrey Lean, Environment Editor
Sunday, 18 May 2008
Women who use mobile phones when pregnant are more likely to give
birth to children with behavioural problems, according to
A giant study, which surveyed more than 13,000 children, found that
using the handsets just two or three times a day was enough to raise
the risk of their babies developing hyperactivity and difficulties
with conduct, emotions and relationships by the time they reached
school age. And it adds that the likelihood is even greater if the
children themselves used the phones before the age of seven.
The results of the study, the first of its kind, have taken the top
scientists who conducted it by surprise. But they follow warnings
against both pregnant women and children using mobiles by the official
Russian radiation watchdog body, which believes that the peril they
pose ''is not much lower than the risk to children's health from
tobacco or alcohol''.
The research at the universities of California, Los Angeles (UCLA)
and Aarhus, Denmark is to be published in the July issue of the
journal Epidemiology and will carry particular weight because one of
its authors has been sceptical that mobile phones pose a risk to
UCLA's Professor Leeka Kheifets who serves on a key committee of
the International Commission on Non-Ionizing Radiation Protection, the
body that sets the guidelines for exposure to mobile phones wrote
three and a half years ago that the results of studies on people who
used them ''to date give no consistent evidence of a causal
relationship between exposure to radiofrequency fields and any adverse
The scientists questioned the mothers of 13,159 children born in
Denmark in the late 1990s about their use of the phones in pregnancy,
and their children's use of them and behaviour up to the age of seven.
As they gave birth before mobiles became universal, about half of the
mothers had used them infrequently or not at all, enabling comparisons
to be made.
They found that mothers who did use the handsets were 54 per cent more likely to have children with behavioural problems and that the
likelihood increased with the amount of potential exposure to the
radiation. And when the children also later used the phones they were,
overall, 80 per cent more likely to suffer from difficulties with
behaviour. They were 25 per cent more at risk from emotional problems,
34 per cent more likely to suffer from difficulties relating to their
peers, 35 per cent more likely to be hyperactive, and 49 per cent more
prone to problems with conduct.
The scientists say that the results were ''unexpected'', and that they
knew of no biological mechanisms that could cause them. But when they
tried to explain them by accounting for other possible causes such
as smoking during pregnancy, family psychiatric history or
socio-economic status they found that, far from disappearing, the
association with mobile phone use got even stronger.
They add that there might be other possible explanations that they did
not examine such as that mothers who used the phones frequently
might pay less attention to their children and stress that the
results ''should be interpreted with caution'' and checked by further
studies. But they conclude that ''if they are real they would have
major public health implications''.
Professor Sam Milham, of the blue-chip Mount Sinai School of Medicine
in New York, and the University of Washington School of Public Health
one of the pioneers of research in the field said last week
that he had no doubt that the results were real. He pointed out that
recent Canadian research on pregnant rats exposed to similar radiation
had found structural changes in their offspring's brains.
The Russian National Committee on Non-Ionizing Radiation Protection
says that use of the phones by both pregnant women and children should be ''limited''. It concludes that children who talk on the handsets are likely to suffer from ''disruption of memory, decline of attention,
diminishing learning and cognitive abilities, increased irritability''
in the short term, and that longer-term hazards include ''depressive
syndrome'' and ''degeneration of the nervous structures of the brain''.
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