Children born outside of the U.S. have a lower prevalence of any allergic diseases in comparison to those who were born in the country, according to a study from St. Luke's-Roosevelt Hospital Center in New York.
The study was published in the Journal of the American Medical Association and lead by Johnathan Silverberg.
The risk factor is about 14 percent higher (20.3 percent versus 34.5 percent). This includes those born outside of the U.S. who spent at least 10 years within the U.S. in their lifetime.
The findings were based on evaluation of phone survey records for more than 92,000 people in the United States between 2007 and 2008. Allergies reported included asthma, eczema, hay fever and food allergies.
The study is a preliminary look at risk factors, but the authors note that the data indicate that the duration of a person's residence within the U.S. is a previously unrecognized factor in allergic reactions.