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Table 1 Four core dimensions of access [22]

From: Improving access to psychosocial interventions for common mental health problems in the United Kingdom: narrative review and development of a conceptual model for complex interventions

Adequacy of Supply If services are available and supply is adequate, then patients have the opportunity to obtain health care. In this situation a population may 'have access' to health care.
Barriers to Access ‘Gaining access’ may be dependent on barriers, including financial, organisational and social or cultural barriers, as well as adequacy of supply.
Effectiveness Services must be clinically effective if access to health care is to lead to access to ‘satisfactory health outcomes'.
Equity Equity may be measured in terms of availability, utilisation or outcomes. Both horizontal (equal treatment for equal groups) and vertical (unequal treatment of unequal groups) equity require consideration.