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Monitor-specific adjusted risk ratios (circles) and 95% CIs (vertical bars) for preterm birth associated with a 5 ppb increase in NO2 levels in the preceding six weeks. Adjusted for long term trends, seasonal trends, race/ethnicity, marital status, education, gestational week and interaction between gestational week and maternal characteristics. Monitoring time periods: Georgia Tech 1/94–12/04, Jefferson St. 8/98–12/04, South DeKalb 1/94–12/04, Tucker 4/95–12/04.
