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Table 2 Case study selection & sampling criteria

From: Evaluating the implementation of a national clinical programme for diabetes to standardise and improve services: a realist evaluation protocol

Case 1

Case 2

Case 3

Case 4

NDP interventions

• Received 2 components

Existing infrastructure and engagement

• Prior DR screening initiative delivered in the community, open to patients in a select number of general practices (no universal access)

• Existing primary care diabetes initiative with voluntary enrolment by some general practices

NDP interventions

• Received 3 components

Existing infrastructure and engagement

• Previous population-based retinopathy screening initiative offered to all general practices in the area

• Existing primary care diabetes initiative with voluntary participation from some practices

• Community DNS

NDP interventions

• Received 3 components

Existing infrastructure and engagement

• Previous hospital service which provided eye screening for those referred to service, no population-based screening programme in the community

• Existing primary care diabetes initiative with voluntary participation from general practices

• Community DNS

NDP interventions

• Received 3 components

Existing infrastructure and engagement

• Previous hospital service which provided eye screening for those referred to service, no population-based screening programme in the community

• No existing primary care-led diabetes initiative

• Community DNS