Figure 2.
Event study estimates of the effect of hydroxyurea use on annual hospital days. Data for the entire sample (top panel) and for the treatment group limited to those who began treatment at 1 year of age (bottom panel) are shown. Points with 95% CIs (y-axis) show the estimated average treatment effect on those treated with hydroxyurea for the given year of therapy (x-axis) relative to never using hydroxyurea. Year 0 is the year of hydroxyurea initiation.