But there were differences in the pattern for young people of different ages.

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"The amendment would in effect discriminate against people of different working ages without any objective policy for doing so, " he said.

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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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