Fig. 2. Multiple exposure–response curves to link PM_2.5 with stillbirth (right y-axis).

The all-ages curve and age-specific curves were derived from our self-matched case-control study of stillbirths from 54 countries (left y-axis). The corresponding PM_2.5 exposures in those countries are shown as boxplots (The centre bars are medians; the box bounds and whiskers indicate for ranges from 25^th to 75^th and from 2.5^th to 97.5^th percentile, respectively.). The red ribbon is the pointwise 95% confidence interval for the all-ages curve.