Figure 1.

Study design. (A) Workflow of the study. (B). Annotation ontology. Clinical notes were annotated such that text relevant to the 7 studied social risk factors (solid border) or 3 clinical factors (dashed border) were marked. Two levels of labels were used, such that the second level was a subcategory of the first. Level 2 labels for each Level 1 annotation are shown in descending order of frequency. Level 2 annotations that comprised <1% of the group’s annotations are not shown. Text that can be classified to the first level but not the second due to ambiguity or low frequency is designated as “NA”. Examples of selected text are shown within the hypothetical clinical note.