Exhibit D.4 illustrates the concepts of undermet and overmet need. For each risk factor, or stroke sequelae, QHPRU listed the kind of intervention that would be effective, and the proportion of people with these risk factors for whom this intervention would be appropriate. This is summarized in exhibit D.5. Use this exhibit as a template to calculate the number of people at risk and the number of people for whom each intervention would be appropriate. QHPRU estimates of the provision of various risk factor interventions is summarized in exhibit D.6. Use this as a template to calculate the gap between services needed and services provided in Eastern Ontario.