Wednesday, May 21, 2008

Using a mobile phone while pregnant can seriously damage your baby?

The endless hatred of anything popular again. If something is popular, the elitists never stop trying to prove that it is bad. They need to show that it is bad to prop up their own feelings of superiority. They have failed so far but, when they never stop trying, they must by chance alone come across some data somewhere that supports their prejudices. Sadly for them, however, what we have below is just epidemiological speculation again. What they REALLY found is probably that early adopters of technology are more self indulgent and that self-indulgent mothers have kids who are more disturbed.

A medical correspondent also asks: "Are women with cell phones also likely to give cell phones to their children -- who then will not be paying attention and doing their homework, but chatting mindlessly and sending friends text messages in class etc..?"

It's all speculation. Epidemiology cannot prove ANY causal link, any more than rodent studies can (except among rodents), and policy prescriptions should not be based on it.

Women who use mobile phones when pregnant are more likely to give birth to children with behavioural problems, according to authoritative research. 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 health. 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 health effect".

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".


Breast-feeding, but not oral contraceptives, is associated with a reduced risk of rheumatoid arthritis

The results below are again epidemiological so permit no firm inferences but, as rheumatoid arthritis is one of those intrinsically hard-to-explain autoimmune diseases, new lines of investigation are welcome. Since women who do not breastfeed are a biological aberration and since autoimmune diseases are too, there is some plausibility to the connection made below

New research at Malmo University Hospital has revealed that mothers who have more children and especially those who breastfeed their babies have a significantly lowered risk of arthritis later in life. Use of oral contraceptives, on the other hand, is of no benefit.

The study, which was funded by Lund University, The Craaford Foundation and the Swedish Rheumatism Association, wanted to determine whether breast-feeding or the use of oral contraceptives (OC) could affect the future risk of rheumatoid arthritis (RA) in a community-based prospective cohort.

Researcher Dr. Mitra Pikwer found that breastfeeding for more than a year reduced women's risk of rheumatoid arthritis 54% and breastfeeding for at least a month tended to reduce the risk 26 percent. Moreover, women who gave birth to more children tended to be at lower RA risk, with a 13% reduction for each child they had.

Female hormones are thought to play a role in rheumatoid arthritis because the incidence is twice as high for women than men, the researchers said. While arthritis often improves during pregnancy, there was no evidence of benefits in RA from the use of oral contraceptives, which contain some of the same hormones that are elevated during pregnancy.

From a community based health survey of 18,326 women, the analysis included 136 women with incident rheumatoid arthritis who were matched by age to 544 women (controls) in the study who did not have rheumatoid arthritis.

Women who had breastfed their children for 13 months or more had an odds ratio of 0.46 for incident RA and those who breastfed for one to 12 months had an odds ratio of 0.74 compared with those who had never breastfed.

See an abstract of the research here


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