Figure 1. Model Schematic for Natural History of Injection Drug Use and Related Sequelae Among People Experiencing Homelessness.

Using the model parameters specified in the Table, a microsimulation of the heterogeneous natural history of injection drug use among people experiencing homelessness was used. The schematic demonstrates how individuals “move through” different modules in the model related to sequelae of injection drug use, health care access, behavioral changes, and mortality. A comprehensive model description is included in Supplement 1.