Gurreri 2019.

Study characteristics
Methods	Study design: retrospective cohort Location: Italy Time period: February 2012 to December 2017 Outcome: PDR Outcome measurement: incidence
Participants	Number of participants: 479 Diabetes type: T2D Inclusion criteria: T2D with NPDR; patients who visited department between February 2012 and December 2017 Exclusion criteria: T1D, PDR, age‐related macular degeneration, or other unrelated retinal conditions, incomplete data, or non‐adherence to therapy
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/ytkeh/?view_only=e67462dbac7c4919a51db2ddd32b2319
Item	Authors' judgement	Support for judgement
Study participation	Unclear	See ‘Notes’ above for link to risk of bias assessment
Study attrition	No	See ‘Notes’ above for link to risk of bias assessment
Prognostic factor measurement	Unclear	See ‘Notes’ above for link to risk of bias assessment
Outcome measurement	Yes	See ‘Notes’ above for link to risk of bias assessment
Adjustment for other prognostic factors	No	See ‘Notes’ above for link to risk of bias assessment
Statistical analysis and reporting	Unclear	See ‘Notes’ above for link to risk of bias assessment