Crude and adjusted hazard ratios (95% confidence interval) for newly diagnostic autism spectrum disorders (ASD) from single pollutant model over several years before newly diagnostic ASD.

Note: CO, carbon monoxide; NO2, nitrogen dioxides; O3, ozone; PM10, particles with aerodynamic diameter less than 10 µm; SO2, sulfur dioxide.aAdjusted HRs were adjusted for age, anxiety, gender, intellectual disabilities, preterm, and SES.bAdjusted HRs were adjusted for age, anxiety, gender, intellectual disabilities, obsessive compulsive disorder, phobia, preterm, and SES.