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The question is, why?

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By Amy NortonMONDAY, Sept. 2 (HealthDay News) Males may be the more vulnerable sex when it comes dying young not just from accidents, but from a range of causes, a new study finds. children and teenagers, researchers found that boys had higher death rates than girls from 17 of 19 broad causes.

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Experts have long known that boys have higher risks of developing a number of chronic health conditions from asthma to certain cancers to developmental disorders, said Perrin, a pediatrics professor at Harvard Medical School in Boston. So it makes sense that they would have higher rates of death, not just from injury but from disease, he added.

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While it is rare for children to die, the study based on government data for 1999 to 2008 found that in the United States, boys have a relatively higher risk: Across all ages infancy to age 20 boys and young men were 44 percent more likely to die than girls.

and diseases of the heart, lungs and nervous system.

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Nike Vapormax Khaki Anthracite

Nike Vapormax Khaki Anthracite

has suggested that girls have a certain survival advantage. In many countries, for example, infant mortality is higher for boys. And it's well known that teenage boys are more likely than girls to die from trauma whether from accidents, homicide or suicide.

Both Perrin and Feudtner said genes are probably at least partly to blame. Girls have two "X" sex chromosomes, while boys have an "X" and a "Y" and there are key differences between the two. For one, when the body's cells divide and reproduce themselves, they have a tougher time repairing any damage to genes on the Y chromosome versus the X.

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"But that clearly is not the whole explanation" for boys' higher overall death rates, Feudtner said. When the researchers looked at broad disease categories, boys were more likely to die from most of those causes, too.

The answer, his team reports, is "yes."

The biggest gender gap was seen among those 15 to 19 years old, which was expected, Feudtner said. When it came to cause of death, injuries accounted for the biggest divide: Boys were more than twice as likely to die of an "external cause."

Those included not only accidents in which boys' greater risk taking can come into play but also Nike Vapormax Khaki Anthracite cancer Nike Vapormax Plus Mens

Feudtner's team also had information on seven different types of pediatric cancer, including leukemia and brain cancer. Boys were at slightly greater risk of death from each cancer either because they were more likely to develop the cancer, were more likely to die from it, or both.

Death Rates From Many Causes

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The findings are "important," if not surprising, according to Dr. James Perrin, president elect of the American Academy of Pediatrics.

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"This could be a story of resilience and ability to overcome," Feudtner added. "Maybe there's some robustness factor that males are missing."

Feudtner said boys may have some inherent "vulnerability" to developing serious disease, and once they do, to die from it. Or, he said, girls may have an inherent "robustness."

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"But do we see it across a range of ages? Do we see it across a range of causes?" asked Dr. Chris Feudtner, a pediatrician at the Children's Hospital of Philadelphia who led the new study.

Over the decade, there were about 76,700 more deaths among boys than girls, according to the report published online Sept. 2 in Pediatrics.

Figuring out why boys have higher death rates could also aid in the wider understanding of different diseases, Feudtner noted. "It could help everyone if we understand the factors at work," he said.

Feudtner said there could also be important "epigenetic" differences between boys and girls that is, differences in which genes are "turned on" or "turned off" at various points during development.

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