The study involved 5, 362 people between the ages of 45 and 84 living in six different cities that are part of the MESA AIR (Multi-Ethnic Study of Atherosclerosis and Air Pollution) research project, led by Joel Kaufman.

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The ethnic differences cited in the study could have to do with genetic predisposition, but that connection has yet to be defined, Mattox said.

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The numbers are growing across racial and ethnic groups, except for Asian women, the study said.

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Dr Jepson's work was part of a study funded by NHS Health Scotland to look into the levels of physical activity in minority ethnic groups.

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Dawson also believes that the study clearly confirms that autism is a significant global public health concern that transcends cultural, geographic and ethnic boundaries.

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Today, even though Native Americans are still the poorest of the poor, a recent study shows that we have increased our population rate and our per-capita income more than any other ethnic group in the country during the past decade.

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