Lee 2021.

Study characteristics
Methods	Study design: retrospective cohort Location: Taiwan Time period: 12 October 2012 to 11 September 2018 Outcome: PDR Outcome measurement: HR
Participants	Number of participants: 2626 Diabetes type: T2D Inclusion criteria: T2D with more than two fundus colour photography tests   Exclusion criteria: without T2D; no HbA1c or fasting plasma glucose tests within 14 days of the study start; PDR
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/y7mu2/?view_only=4001f0cef1cf4908b0df27446ffb93d8
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	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