Okudaira 2000.

Study characteristics
Methods	Study design: prospective cohort longitudinal Location: Japan Time period: first visited clinic 1980 to 1989 Outcome: PDR Outcome measurement: incidence, and HR
Participants	Number of participants: 527 Diabetes type: T2D Inclusion criteria: first visited the outpatient clinic between 1980 and 1989; exhibited neither proteinuria nor PDR at the first visit; were seen at the clinic for at least 1 year; underwent fundus examination through dilated pupils by ophthalmologists at least once a year during the follow‐up Exclusion criteria: only one fundus examination during follow‐up
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/hdz59/?view_only=e8e573cc08e441d088dc630e8adf5093
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	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