Figure 3

The schema of database for the DOMI typhoid vaccine trial programs. The data table names are shown inside brackets next to the form name. The linkage keys are shown next to the box of the data table. The logical relationships between the entities are shown in parenthesis. In a relationship (1,N), "1" indicates each entity of the table will link to at least one entity of the other table, and "N" indicates multiple entities of the table may link to at least one entity of the other table. In a relationship of (0,N), "0" indicates not all entities of the table will link to another table. And, in a relationship of (1,1), the later "1" indicates a single entity will link to at least one entity of the other table.