Fig. 9. Zrelscores can increase after an education intervention. The mean monthly Zrelscores for a single resident are shown for 4 months before and 4 months after an education intervention. The intervention occurred at the arrow . The resident's mean Zrelscores for the 4 months before and after the intervention differ (P = 0.003) and are shown by the gray lines . Error bars are the 95% CI on the mean.