Chen 1995.

Study characteristics
Methods	Study design: prospective cohort longitudinal Location: Taiwan Time period: 1986 to 1990 Outcome: PDR Outcome measurement: cumulative incidence
Participants	Number of participants: 471 Diabetes type: T2D Inclusion criteria: age ≥ 40 years; fasting or 2‐hour post‐prandial blood glucose level indicating DM according to WHO, or receiving insulin or sulphonylurea agents for diabetic control; ocular fundus clearly visible by ophthalmoscopy Exclusion criteria: history of diabetic ketoacidosis; insulin therapy within one year of diagnosis of diabetes
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/6rqcu/?view_only=d40b2521ba98457690f0c5b2ea8a406f
Item	Authors' judgement	Support for judgement
Study participation	Unclear	See ‘Notes’ above for link to risk of bias assessment
Study attrition	Unclear	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