Figure 2. Sources of Errors and Adverse Events (AEs).

Sources of medical errors as validated through 2-step methodology (research clinician review followed by review by 2 physicians) across all 4 sites. Additional sources of medical errors included observation (eg, by study nurse while on unit; n = 12) and other (n = 8). Additional sources of AEs included observation (n = 7) and other (n = 4).

^aCategories are not mutually exclusive, so numbers do not sum to 179 errors and 113 AEs.

^bThere were 0 unique medical errors reported through hospital incident reports.