Fig. 3.

Estimated bi-parietal diameter growth trajectories and relative differences for different levels of pollutant exposure. Top panels show estimated growth trajectories for minimum exposure (solid lines) compared to maximum exposure (dashed line). Bottom panels show the difference in these trajectories expressed in units of SD scores. The models are adjusted for parity, age, sex, smoking, social class, maternal height and weight. To aid interpretation, x axis is truncated below 25 weeks.