Fig. 1.
Weekly associated hazard ratios (HRs) associated with weekly PM2.5, NO2, and O3 exposures over the preconception period and the gestational period with risk of gestational diabetes in the overall cohort (n = 1,310,807). Gray shade indicates 95% confidence intervals; dashed vertical line demarcate preconception and post conception weeks. All the models were adjusted for maternal age, parity, maternal smoking status, prepregnancy body mass index, weekly ambient temperatures, month of birth, year of birth, residing in the Greater Toronto Area, community size, deprivation quintiles, instability quintiles, dependency quintiles and ethnic quintiles