Cho 2019.

Study characteristics
Methods	Study design: retrospective cohort longitudinal Location: South Korea Time period: 2006 to 2014 Outcome: PDR Outcome measurement: prevalence, OR
Participants	Number of participants: 1527 Diabetes type: T2D Inclusion criteria: T2D from the diabetes clinic in the Department of Endocrinology of Kangnam Sacred Heart Hospital who underwent fundus photographic examinations for DR and whose renal profiles were studied between August 2006 and February 2014 Exclusion criteria: estimated glomerular filtration rate < 15 mL/min/1:73 m2 and without follow‐up renal profiles; fundus exam obtained more than 3 months after the first evaluation
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/3qt9w/?view_only=03b2f088652d44de83fe308b6e1b5070
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	Unclear	See ‘Notes’ above for link to risk of bias assessment
Adjustment for other prognostic factors	Unclear	See ‘Notes’ above for link to risk of bias assessment
Statistical analysis and reporting	Yes	See ‘Notes’ above for link to risk of bias assessment