On average, Hispanics outlive whites by 2.5 years and blacks by 7.7 years. Their life expectancy at birth in 2006 was 80.6 years, compared with 78.1 for whites, 72.9 for blacks and 77.7 years for the total population.

　　The report shows that the Hispanic population has higher life expectancy at birth and at almost every age despite a socioeconomic status lower than that of whites. “Mortality is very correlated with income, education and health care access,” says Elizabeth Arias, author of the report. “You would expect the Hispanic population would have higher mortality, in line with the black population.”

　　The Hispanic paradox has been documented for more than two decades, but this is the first time the government has had enough data to issue national numbers. Researchers are struggling to explain why Hispanics live longer.

　　“We don’t know,” says David Hayes-Bautista, director of the Center for the Study of Latino Health and Culture at UCLA’s David Geffen School of Medicine. “We thought it was a problem in the data, but we can pretty much say this is real.”

　　Potential factors:

　　·Culture and lifestyle. Support from extended family and lower rates of smoking and drinking. Latino groups in particular have very strong family and social ties.

　　·Migration. The “healthy migrant effect” argues that healthy people are more likely to emigrate. And when immigrants become ill, they might return home and die there.

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