Fig. 2From: The reduction of birth weight by fine particulate matter and its modification by maternal and neighbourhood-level factors: a multilevel analysis in British Columbia, CanadaAdjusted predicted effects of maternal risk factors on birth weight across levels of PM2.5. a Maternal Smoking b Suspected Drug or Alcohol Use c Maternal Age d Gestational Diabetes. Predicted effects on birth weight with 95Â % confidence intervals are conditional on model covariates included in Model 4. Black vertical lines represent the frequency distribution of PM2.5 Back to article page