This procedure yields a very large number of observations since most infants survive all 52 weeks of their first year.
In order to reduce the number of observations, we limit this part of the analysis to mothers who lost at least one child.
In terms of observable characteristics, families with a death are more likely to have mothers who are African American (30% vs. 19% overall), unmarried (62% vs. 72% overall) and who are smokers (13% vs. 9.5% overall).
However,mean ozone, CO, and PM10 measures in the trimester before birth are virtually identical in families with deaths and those without.
This procedure yields a very large number of observations since most infants survive all 52 weeks of their first year.
In order to reduce the number of observations, we limit this part of the analysis to mothers who lost at least one child.
In terms of observable characteristics, families with a death are more likely to have mothers who are African American (30% vs. 19% overall), unmarried (62% vs. 72% overall) and who are smokers (13% vs. 9.5% overall).
However,mean ozone, CO, and PM10 measures in the trimester before birth are virtually identical in families with deaths and those without.
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