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. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: Ann Epidemiol. 2018 Jun 13;28(9):612–618.e4. doi: 10.1016/j.annepidem.2018.06.003

Fig. 3.

Fig. 3.

Adjusted relative risksa between criteria air pollutants and risk of respiratory distress syndrome (RDS; n = 7325 cases among 223,375 singleton births). Abbreviations: CO, carbon monoxide; NOx, nitrogen oxides; O3, ozone; PM10, particulate matter ≤10 microns; PM2.5, particulate matter ≤2.5 microns, SO2, sulfur dioxide.a Multipollutant models adjusted for region, marital status, parity, maternal age, maternal race, caesarean delivery, type of insurance, maternal BMI, smoking/alcohol, comorbidities (HIV, hypertension, diabetes, thyroid disease), season of conception, and asthma. Relative risks are estimated for an IQR increase in pollutants. * Denotes statistical significance at P < 0.05.